Mercedes-Benz C-Class Mercedes-Benz C-Class

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Mercedes-Benz C-Class repairs by problem area

Engine (30%)

Transmission and Drivetrain (7%)

Brakes and Traction Control (4%)

Suspension and Steering (10%)

Electrical and Air Conditioning (31%)

Paint, Rust, Leaks, Rattles, and Trim (12%)

Other (6%)

Chart based on 1640 repairs.
See TSBs and recalls for the Mercedes-Benz C-Class.

Mercedes-Benz C-Class engine repair cost distribution

$2500+ (4%)

$1000 - $2499 (15%)

$500 - $999 (13%)

$100 - $499 (30%)

< $100 (38%)

Worried about potential repair costs? An extended warranty can provide peace of mind.

Chart based on 398 repair trips. The repair cost chart excludes repairs made under warranty, do-it-yourself repairs, and repair trips that include maintenance.

2016 Mercedes-Benz C-Class 4dr Sedan

turbocharged 503hp 4.0L V8 7-speed shiftable automatic RWD

22000 mi Recall for faulty ignition coils 

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2016 Mercedes-Benz C-Class 4dr Sedan

turbocharged 362hp 3.0L V6 7-speed shiftable automatic AWD

23000 mi Exhaust sensor replaced 

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2016 Mercedes-Benz C-Class 4dr Sedan

turbocharged 241hp 2.0L I4 7-speed shiftable automatic RWD

18000 mi Fuel line leading to high pressure fuel pump split, causing fuel to slowly seep into the engine bay and resulting in a strong smell of gasoline. 
2000 mi Check engine light on. Code set for Evap Purge Solenoid. Code could not be duplicated. Erased code. 

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2016 Mercedes-Benz C-Class 4dr Sedan

turbocharged 241hp 2.0L I4 7-speed shiftable automatic AWD

10000 mi Another increasingly common system that's difficult to classify. The Eco Start/Stop system quit working as designed. It has essentially working backwards, functioning when unexpected, not functioning when anticipated. Dealer couldn't find issue, so said it was fine. Hasn't worked once in two months - even though all known parameters have been met - engine at operating temp, passenger compartment st set temps, fully charged (hopefully after 100+ miles) but no longer working. Dealer seems beyond their depth with these systems so to save frustration I've decided to just pretend I don't have the features 

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2015 Mercedes-Benz C-Class 4dr Sedan

turbocharged 329hp 3.0L V6 7-speed shiftable automatic AWD

5000 mi The car randomly goes into limp mode. The cause of the problem is unknown. 

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2015 Mercedes-Benz C-Class 4dr Sedan

turbocharged 241hp 2.0L I4 7-speed shiftable automatic AWD

11000 mi replaced faulty crankshaft position sensor which caused missed shifts and limp home mode. 
11690 mi Engine low on coolant. Coolant added. No reason discovered, recall work performed. 
auto start engine problems. car would stall randomly at lights. 
21000 mi the random jerkiness of the transmission was due to a not working crankshaft sensor. 
33000 mi Gasoline smell inside vehicle and in engine compartment. Fuel leak discovered by technician. Replaced the fuel line to the high pressure fuel pump. 
on cold morning start up time, fan belt gip, gip sound for 5 minutes. Replace fan belt as describe on technical bulletin and Update to latest software for engine management. 
5000 mi 1. replace engine piston wrist pin: result - engine chipping noise disappear when first startup and when going downhillrn2. replace front window glass with acoustic glass:result - no more excessive window noise. 
13000 mi Check engine light on 
13000 mi The push button start failed 
38000 mi A valve wouldn't open because condensation was freezing. Part was replaced under warranty. 
2000 mi Faulty piston and piston rings 
23000 mi Engine wrist pin issue. Part replaced. 
3000 mi The engine has a loud ticking sound after start-up. 
15000 mi The engine makes a terrible rattling sound for about 10 minutes after ignition. 

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2015 Mercedes-Benz C-Class 2dr Coupe

507-horsepower 6.2L V8 7-speed shiftable automatic RWD

8680 mi

C $550
Engine light came on just one month after my last maintenance. Took a trip to dealership. Covered by warranty. Also replace a broken day-time running light. 

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2014 Mercedes-Benz C-Class 4dr Sedan

248-horsepower 3.5L V6 7-speed shiftable automatic AWD

69000 mi Injector failed causing engine to misfire. Diagnosis took several days, then had to wait for replacement injector. 
31000 mi

US $255
General maintenance no parts replaced 

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2013 Mercedes-Benz C-Class

Engine not specified

16000 mi

US $1900
Lights continuously have fault warning 

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2013 Mercedes-Benz C-Class 4dr Sedan

turbocharged 201hp 1.8L I4 7-speed shiftable automatic RWD

33000 mi idle pulley worn out radiator expansion reservoir was leaking 

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2013 Mercedes-Benz C-Class 4dr Sedan

302-horsepower 3.5L V6 7-speed shiftable automatic RWD

2700 mi Timing chain tensioner had defective check valve causing rattle sound at start. 

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2013 Mercedes-Benz C-Class 4dr Sedan

248-horsepower 3.5L V6 7-speed shiftable automatic AWD

48000 mi

US $200
water pump leak, replaced leak near muffler 
19220 mi Coolant leak.. 
70000 mi

US $250
Ignition coil needed to be replaced 
39000 mi Fuel pump control module drawing down battery when car shut off 

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2013 Mercedes-Benz C-Class 2dr Coupe

turbocharged 201hp 1.8L I4 7-speed shiftable automatic RWD

35340 mi

C $275
On changing oil at an independent shop, the mechanics said there was a gasoline smell in the oil. The car was brought to the dealership and the next day we were told it was not unusual. Nothing was wrong with the car they say. ? 

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2012 Mercedes-Benz C-Class

Engine not specified

27940 mi

$1200
Engine Mounts and Transmission Mount replaced. Wipers also replaced. I CANNOT BELIEVE I HAD TO CHANGE ENGINE MOUNTS AT 50K KMS! 
93000 mi

US $120
Shaking of vehicle felt under passenger seat. Replaced transmission mount 
94000 mi

US $20
Replaced Bolt on Engine to eliminate spoke 

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2012 Mercedes-Benz C-Class 4dr Sedan

turbocharged 201hp 1.8L I4 7-speed shiftable automatic RWD

21700 mi I identified noise from the turbocharger. Dealer mechanic says it's normal. I'm not sure!!! 
7000 mi Check engine warning light came on and vehicle could only ran 40mph max. System reset itself after 1 day not driving. Diagnosed with low fuel pressure, possibly sensor switch malfunction. Dealer only uploaded vehicle with new updated software. 
51000 mi repaired tension guide 
40000 mi ECU software update 
60000 mi

US $800
Cam shaft adjusters needed to be replaced. Car was out of warranty, but dealer and/or MBUSA didn't charge for parts, only labor. 
60500 mi

US $2000
Engine malfunction 
63000 mi Traded car because of engine problem that would have cost $3k to fix. 
25000 mi Fuel pump failing resulting in occasional poor fuel delivery, rough acceleration and check engine light 
59700 mi High pressure fuel pump failed and was replaced. 

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2012 Mercedes-Benz C-Class 4dr Sedan

302-horsepower 3.5L V6 7-speed shiftable automatic RWD

10000 mi Engine noise on cold start; sounds like rattling, as if valve clatter. Stops after engine runs for about 30-60 seconds. Diagnosed by Dealer/Regional staff; TSB, metal fatigue, wrist pins; required removing engine and replacing all 6 pistons/rods 

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2012 Mercedes-Benz C-Class 4dr Sedan

302-horsepower 3.5L V6 7-speed shiftable automatic AWD

29760 mi M276 engine TSB for timing chain secondary pulley causing rattle on startup. TSB calls for anti-drain valve to be installed in each oil supply orifice serving the pulley. 

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2012 Mercedes-Benz C-Class 4dr Sedan

228-horsepower 3.0L V6 7-speed shiftable automatic AWD

8700 mi Oil leak 
32240 mi

C $450
Pulley and belt replaced for a squeek. 
45500 mi CEL came on. Left bank misfire 
28000 mi air intake sensor 
38000 mi Squeezing fan belt, caused by previous repair when coolant leak caused. 

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2012 Mercedes-Benz C-Class 2dr Coupe

302-horsepower 3.5L V6 7-speed shiftable automatic AWD

20800 mi Rattling noise after engine start for several seconds timing chain tensioner needed check valves put in. 

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2011 Mercedes-Benz C-Class 4dr Sedan

228-horsepower 3.0L V6 7-speed shiftable automatic RWD

51000 mi Replaced thermostat 
70000 mi

US $350
Emissions-secondary air pump 
35000 mi

US $85
Oil change 

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2011 Mercedes-Benz C-Class 4dr Sedan

228-horsepower 3.0L V6 7-speed shiftable automatic AWD

48000 mi Engine operating temp sensor failed and was replaced under warranty. 
71000 mi engine runs rough on start, exhaust has unburned fuel smell. 
80900 mi

US $1200
electronic steering column ignition lock 
88873 mi

US $200
Thermostat needed to be replaced, a code was showing. 
105870 mi

US $260
Belt, Tensioner and pulleys replaced. The repair was entirely preventive, due to the mileage on the car. Also on the MB World Org site a lot of owner where stating they were having problems with their belts breaking or the tensioner locking up,or the pulley making noise. So for the few bucks and my time as the car is my daily driver I figured better be safe than sorry. 

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2011 Mercedes-Benz C-Class 4dr Sedan

228-horsepower 3.0L V6 6-speed manual RWD

64000 mi

US $780
Traction control lights on. Engine lost power. Dealer replaced accelerator pedal but repair was unsuccessful. 

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2010 Mercedes-Benz C-Class 4dr Sedan

451-horsepower 6.2L V8 7-speed shiftable automatic RWD

16000 mi Minor engine miss; also $500 to replace broken fog light 

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2010 Mercedes-Benz C-Class 4dr Sedan

268-horsepower 3.5L V6 7-speed shiftable automatic AWD

42760 mi

C $160
Thermostat seems to be affecting lots of customers…. 

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2010 Mercedes-Benz C-Class 4dr Sedan

228-horsepower 3.0L V6 7-speed shiftable automatic RWD

7000 mi On cold start up the engine sounds as though there is a bearing clearance problem between the crank and front main bearing. Shop could not replicate nor hear the issue. I advised we would know when the bearing spins. 
95000 mi

US $550
Ignition switch malfunction. 
103000 mi

US $730
Replaced the thermostat 
137000 mi

US $3000
Engine Mounts needed to be replaced because you could feel vibration while driving. Once repaired car was noticeably smoother. 
65100 mi

US $400
Replaced bad thermostat and housing. 
58000 mi

US $80
Check engine light- misfire cylinder 3. Spark plugs changed. Check engine light cleared. 
39000 mi Check engine light lit and they performed software update on engine control unit. 
43200 mi PURGE VALVE STIKY OPEN CAUSING LEAK IN EVAP SYSTEM, REPLACED THE PURGE VALVE 
58000 mi

US $90
Sluggish acceleration 
71000 mi

US $300
The 2nd exhaust resonater caused excessive restriction to the flow of the exhaust. Black and plugged up. Upon switching out to an aftermarket high flow dual resonator the vehicle definitely ran better. This was described earlier with the last maintenance. 

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2010 Mercedes-Benz C-Class 4dr Sedan

228-horsepower 3.0L V6 7-speed shiftable automatic AWD

44020 mi

C $200
High pitch noise coming from accessory drive upper pulley. Replaced Pulleys, belt, and belt tensioner as a precaution. 
95600 mi

US $747
purge valve 
40000 mi low coolant level due to extreme cold weather 
52000 mi

US $1780
Replaced left upstream O2 sensor. 
58000 mi

US $1
Replaced air pump, which was making a noise. 

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2010 Mercedes-Benz C-Class 4-door

turbocharged 4-cylinder automatic 2WD

83700 mi

€170
Temperature sensor failed causing an over temperature warning to occur. Sensor replaced 
84940 mi Loss of coolant, small leak from RHS engine component (sorry don't know name). Two gaskets replaced 12€ labour 130€ antifreeze 10€ 
86180 mi

€415
Leak from water pump, therefore water pump was replaced 

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2010 Mercedes-Benz C-Class 4-door

6-cylinder automatic AWD

65720 mi

C $1000
Intake manifold needed replacing. Variable length runner malfunction for left cylinder bank. Loud engine noise past 3900rpm, loss of power. NO check engine light or codes present. Car driveable keeping under 3900rpm. 

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2009 Mercedes-Benz C-Class 4dr Sedan

turbocharged 221hp 3.0L V6 Diesel 7-speed shiftable automatic AWD

16120 mi Faulty glow plug. 
60140 mi

£200
Replaced 3 faulty glow plugs 

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2009 Mercedes-Benz C-Class 4dr Sedan

turbocharged 201hp 2.1L I4 Diesel 6-speed manual RWD

5952 mi Injectors (Delphi) failed. Mercedes will make a recall of this kind of injector installed in all the C220 and C250 Blue Efficiency models as soon as Delphi can produce them Injectors failed, under warranty, but Mercedes doesn't have enough injectors to fulfill all those c220 and c250 that are breaking down. I expect to have my car in 2 or 3 weeks. This is really sad...so much tests, and about40%of the Delphi injectors 
63540 mi

€120
A transmission rubber support which was changed last year had to be changed again Rubber support of the engine was damaged and was replaced 
65100 mi

€95
Burn oil smell came from the engine. It was a faulty o-ring in one injector. 
79980 mi

€500
Water pump leaking 
80080 mi

€450
Lambda sensor failed 

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2009 Mercedes-Benz C-Class 4dr Sedan

supercharged 181hp 1.8L I4 5-speed shiftable automatic RWD

44640 mi

$450
Motor and transmission mounts required replacement. 
45360 mi

$1200
Check engine light illuminated, engine occasionally stalled after starting. When running, no obvious driveability issues except possible decreased power output. 

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2009 Mercedes-Benz C-Class 4dr Sedan

268-horsepower 3.5L V6 7-speed shiftable automatic RWD

81000 mi

US $175
Oil leaking from engine oil vents 
67780 mi

$1600
Engine intake manifold. One of the rods broken but the only to repair is to replace the whole manifold. Bad design from Mercedes Benz. 
83680 mi

$200
Cold air intake tubes cracked due to wear and tear. 
120000 mi

US $1600
2x Motor Mounts & 1x Transmission Mount 

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2009 Mercedes-Benz C-Class 4dr Sedan

268-horsepower 3.5L V6 7-speed shiftable automatic AWD

9920 mi Lag in shifting between Drive and Reverse in transmission. Dealer noted "no problem detected", and advised that latest software was already installed. Dealer performed a reset/relearn on the transmission. 

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2009 Mercedes-Benz C-Class 4dr Sedan

228-horsepower 3.0L V6 7-speed shiftable automatic RWD

9000 mi When the car is cold (first driven during the day and when it's cold outside), a minute after it's started and for about 2 minutes a squeak(1 sec separating) comes from what sounds like a belt pulley. It did this last winter too.  
27000 mi Cold-start metallic squeaking sound, present since new, was traced to a defective belt pulley. Pulley and also belt replaced under warranty; haven't noted problem since. 
68000 mi

US $2200
Collapsed transmission mount and all engine mounts (leaking) replaced. Replaced serpentine belt and pulley. 

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2009 Mercedes-Benz C-Class 4dr Sedan

228-horsepower 3.0L V6 7-speed shiftable automatic AWD

8000 mi the fuel cap indicator was on, and wouldn't go off after a couple of re-fueling efforts (and of course, after tightening the cap). apparently there was no problem after they ran it through their system and did the same thing. 
12000 mi

US $300
When I bought this car, the infamous salesman at the Oakland dealership assured me it was a flex-fuel car. Now, in Minnesota where getting E85 is so easy, we tried to find engine light on. I am now told not all C300 are E85 ready. 
60000 mi

US $2000
Oil leaks in two places: oil leaks have been found, one from the engine and one from the transfer case. I was told that it's typically found on all wheel drive vehicles (for Mercedes I assumed). 
26000 mi Cam plugs leaking and were replaced. 
49000 mi

US $800
Engine mounts collapsed. Transmission mounts replaced at same time to save future labor cost. 204-240-15-17 204-240-06-18 Rear cylinder head oil centrifuge leaking. 272-010-06-31 Replaced. 
139000 mi

US $450
thermosat stuck open 
242000 mi

US $1500
Motor mounts (2), and Transmission mount (1) 

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2009 Mercedes-Benz C-Class 4dr Sedan

228-horsepower 3.0L V6 6-speed manual RWD

179000 mi

US $4000
Flap regulating flow of air to intake manifold broke 

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2008.5 Mercedes-Benz C-Class 4dr Sedan

turbocharged 168hp 2.1L I4 Diesel 5-speed shiftable automatic RWD

52000 mi Transmission lag on "take off". Software update seems to have fixed the issue. 

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2008.5 Mercedes-Benz C-Class 4dr Sedan

supercharged 181hp 1.8L I4 6-speed manual RWD

79980 mi Car started misfiring then refused to start. The cam gears were damaged and caused the cam to skip a few teeth and gave a cam sensor fault. Engineer replacing valves and valves guides. Cost of repairs was R33500. Luckily had an extended warranty. 

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2008 Mercedes-Benz C-Class 4dr Sedan

turbocharged 134hp 2.1L I4 Diesel 5-speed shiftable automatic RWD

9300 mi Small increase in fuel consumption Checked.No problem found.  
74160 mi

A $2000
EIS module. Car was terminally dead had to be loaded onto a truck and taken to the dealer. 
85560 mi

A $300
egr valve failed black smoke from exhaust found ruptured pipe between intercooler and turbo 
89900 mi Poly Belt tensioner failed 

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2008 Mercedes-Benz C-Class 4dr Sedan

supercharged 181hp 1.8L I4 5-speed shiftable automatic RWD

82460 mi

€2000
Chain problems and propshaft bearing 

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2008 Mercedes-Benz C-Class 4dr Sedan

supercharged 154hp 1.8L I4 5-speed shiftable automatic RWD

63240 mi

$1000
Replacement of secondary air flap actuator 
79980 mi

$2800
Replaced the steering lock ECU which had malfunctioned and immobilized the car. Replaced camshaft magnet clutch together with plug and seal ring, as these were leaking oil. 

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2008 Mercedes-Benz C-Class 4dr Sedan

268-horsepower 3.5L V6 7-speed shiftable automatic RWD

43000 mi Retrofit Adapter Wiring Harness on Camshaft Adjustment Solenoids 
36000 mi

US $175
Crank position sensor malfunctioning -- replaced. 
34000 mi

US $800
Transmission mounts on the way to collapsing.  
13000 mi We began to notice a shifting problem as the car which has gotten worse as the mileage increased. It would "stick" or not downshift quickly. The software upgrades were installed via the MB network to the car and this improved the problem. MPG increased! 
131100 mi

US $350
Oil Cover leak 
39000 mi Engine sensor. 
54000 mi

US $280
Leaking water from cylinder block. Replaced expansion plugs. 
12000 mi Check engine light came on. Dealer reported it was an issue wit a sensor, reflashing the computer fixed the error.  
34880 mi

$200
Check Engine light warning on dashboard. Dealer cleaned ignition system and some engine parts. 
16000 mi Coolant leak on freeway - loose hose; covered under warranty.  Coolant leak on freeway - loose hose; covered under warranty. Fogging in headlights (Xenon) - MB states this is 'normal'; Software upgrade to Media player (media player would lock-up malice Seat rails replaced (previous complaint now resolved 

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2008 Mercedes-Benz C-Class 4dr Sedan

268-horsepower 3.5L V6 7-speed shiftable automatic AWD

44640 mi EIS (electronic ignition switch) module replaced. 

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2008 Mercedes-Benz C-Class 4dr Sedan

228-horsepower 3.0L V6 7-speed shiftable automatic RWD

988 mi replace right side cylinder head and valve cover due to crack causing loss of oil 
84000 mi

US $1300
Car would not start had to tow to Mb specialty shop. Electronic Steering column lock and Eis system replaced. 
31000 mi Transmission bit slow to downshift. Updated software.  
97000 mi

US $100
replaced two cam sensor magnets on intake due to CEL. Easy DIY with BOSCH parts. Oil leaks through seal into electrical connector causing CEL and issue with cam timing. Previous replaced cam sensors on same bank - but I think magnets was actually what issue is. Common problem. 
104000 mi

US $1250
Temp warning light came on after short trip. Mechanic read codes - thermostat issue and cooling fan issue. Replacing both. 
21000 mi Exhaust Cam Sensor had failed 

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2008 Mercedes-Benz C-Class 4dr Sedan

228-horsepower 3.0L V6 7-speed shiftable automatic AWD

39000 mi Engine would turn over, but not start or even fire. Had to be flat-bedded to dealership. Dealer could not find any problem. Car started right up for them. They did go ahead and update engine software while it was there. Car now running fine. 
53000 mi Transmission was trying to start in two different gears. Would jerk free. No CEL. Dealer determined it needed software update. Car traded the following week. 
50000 mi

US $349
The belt tensioner was broken and had cut part off the belt 
38000 mi Check engine light something with Camshaft, manifold? 
60000 mi

US $600
Check Engine light, cam magnets need replacement. 
68000 mi

US $2500
Idler pulley, serpentine belt replaced 
7000 mi Short in fuel sending unit. Fuel pump and sending unit replaced and computer system reflashed. 
7000 mi Fuel level sending unit was bad. Fuel sending unit replaced. 
116000 mi

US $45
Replaced serpentine belt and idler pulley. The serpentine belt was damaged and caused the pulley to fail. 
13000 mi

US $380
Auto transmission shifting too erratically and frequently for no reason. Software update appears to have corrected the problem. Vehicle was "lurching" forward when coming to a complete stop as transmission shifted back into first gear. Told there was a software update for this. Apparently corrected problem. Pronounced accelerator lag from stop. Software update makes significant improvement, but issue still present to a minor degree. My next MB will be a manual shift though. 
17000 mi Apparently the transmission ECU died. Car would only run in limp home mode. ECU replaced (3x actually) and trans oil replaced.  
100000 mi

US $66
failed idler wheel bearing. Diagnosed and repaired in 1 hour 
124000 mi

US $750
Ignition switch failed, stranding car. Flatbedded to dealer via Merceds Benz Roadside assistance 
6000 mi

US $500
Valve stem caps fused with sensor. 
24000 mi

US $13
transmission lagged from reverse to drive 
24500 mi Idler pulley replaced 
17360 mi cure oil leak 
47120 mi

C $1400
Replaced engine and transmission mounts 
12400 mi Car still takes forever to reach operating temperature. Nine km commute to work isn't enough at close to 0 degree Celsius temperatures, whether city or highway. This hurts fuel economy. Does thermostat stay open? 
30380 mi Low Oil light kept coming on. Dealer changed sensor, and it was worse. I had to go back, and they changed the sensor's connector. No more problem. 
13344 mi Vehicle was towed to the dealer due to having a very noticable bogging of the engine/ feeling of a slipping transmission. After 5 days, dealer neglected to find any problem. 
17000 mi Vehicle was brought to the dealer with the same bogging down problem. Master Technician test drove the car with me but the problem would not re-occur. Problem does exist. 
19000 mi Check engine light comes on while driving. Brought to dealer, code shows that emissions system is inop. Left and right air pump switches get replaced. Issue is solved. 
52000 mi 2. Fluid leaking from cam plugs. Replaced cam plugs. 3. Vibration felt when stopped (with foot on brake). Replaced motor mounts to correct the problem. Performed service action SC-2012070002. Camshaft adjustment solenoid may leak oil due to settling properties of seal and the engine wiring harness will be retrofitted with four adapter harnesses as a precautionary measure. 

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2008 Mercedes-Benz C-Class 4dr Sedan

228-horsepower 3.0L V6 6-speed manual RWD

60000 mi

US $15
Leaking oil from camshaft access port plug 
43200 mi Serpentine belt pulley bearing pending impingement. (Squealing- bearing going bad). Belt beginning to show damage. Steering key lock system failure-Key would not start vehicle. Required replacement key lock mechanism. 
63000 mi

US $280
Schedule B5 maintenance with oil change. Camshaft sensor indicated in codes. Nothing done about it yet. 
42000 mi

US $130
Cam positioning sensors were replaced with no labor charge. Engine light prevented smog check. 
76000 mi Cam Sensors triggering engine warnign light, 2nd time of this same issue, same repair as previous- replace cam adjuster solenoids. 
33480 mi Accessory pulley - bearing noisey 
42000 mi

US $91
Serpentine belt was coming apart and the tensioner was squeaking. Also replaced a bad pulley. 
71000 mi

US $685
Thermostat failed. Thermostat replaced. 
38000 mi

US $130
2nd time serpentine belt replaced and this time the upper guide pulley and the tensioner were replaced. Manufacturers defect in my opinion. 

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2008 Mercedes-Benz C-Class 4dr Sedan

201-horsepower 2.5L V6 7-speed shiftable automatic AWD

57400 mi

C $400
Cylinder misfire. Fuel injector defective 
68200 mi

C $600
exhaust crank sensor defective 

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2007.5 Mercedes-Benz C-Class 4dr Sedan

supercharged 181hp 1.8L I4 5-speed shiftable automatic RWD

89900 mi

R 395
Over time, I sensed a squeaky-sound on early-morning startups and decided, pre-emptively, to have the serpentine belt changed. This one belt drives the alternator, HVAC and other ancillaries. its total failure means the "death"of the vehicle. 

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2007 Mercedes-Benz C-Class 4dr Sedan

268-horsepower 3.5L V6 7-speed shiftable automatic RWD

66000 mi Engine was leaking oil from rear of left cylinder head. Plugs on head replaced per TSB. 
68000 mi Pulley making noise, noticed after reading TSB. 

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2007 Mercedes-Benz C-Class 4dr Sedan

228-horsepower 3.0L V6 7-speed shiftable automatic RWD

39000 mi

US $90
Check Engine light kept going on and off. From online research I determined that this is a problem with the CAM sensor magnets. There is a known issue with the part, which has been redesigned. Replaced with updated part. 
82000 mi

US $100
Thermostat stuck open causing engine to run cool. Replaced as DIY with parts from Amazon. 

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2007 Mercedes-Benz C-Class 4dr Sedan

228-horsepower 3.0L V6 5-speed shiftable automatic AWD

34200 mi

US $850
mass air flow sensor, cam shaft sensor 
72000 mi

US $2300
I had a red check engine light on one morning took it in and this was the problem. Exhaust manifold so I had the work done by the dealership than sold the car 
29000 mi Car gave a warning that oil level was low. Dealer informed me it may have been due to not enough oil put in during last oil change. Or maybe the engine is burning oil. The situation is being monitored. 
32200 mi Camshaft position sensor and magnet were replaced.  
108000 mi

US $23
Replaced Cam sensor magnets. 1 Was bad 3 replaced as preventative maintenance. $23 a piece. 
55800 mi

C $2000
solenoid went... 
126000 mi

US $650
Bad plug cables; oil leak on top end 
137000 mi

US $1200
Electronic Ignition Died. Had to replace key and entire EIS system because of security constraints. 

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2007 Mercedes-Benz C-Class 4dr Sedan

201-horsepower 2.5L V6 7-speed shiftable automatic RWD

15000 mi The automobile believed its crankshaft to be off of alignment. It turned out to be only a malfunctioning sensor. 
36600 mi I floored it while really low on gas, which causes a pressure discrepancy within the fuel pump, which turned on my check engine light. Turns out no problem. 
83000 mi

US $231
Fuel pump failed completely. Replaced fuel pump assembly. 
92000 mi

US $380
Engine cooling fan failed. Replaced engine cooling fan assembly. 
30700 mi Check engine light came on. I scanned it, came out with code P0015. Took to dealership. They got MB codes 0060, 0276. They replaced right side exhaust camshaft solenoid and left intake camshaft solenoid. 
51000 mi

US $45
Replaced two more, one intake one exhaust, Camshaft magnets. The first two sensors went bad while under warranty, the other two failed after warranty so I replaced them in less than one hour. 
31300 mi

US $91
Check engine code came on, scanned p0128, coolant temp below thermostat regulating temp. Ended up replacing thermostat with Wahler (oem supplier) thermostat. Had to use specialty G05 coolant. Easy fix. 
108000 mi

US $100
Engine code: Thermostat below regulating temp blah blah blah. I changed the thermostat, solved problem. 
68900 mi

US $363
Coolant Thermostat Sensor replaced. 
26500 mi Right cam shaft magnet failure (check engine light came on).  
86000 mi

US $796
Cam magnets replaced due to all four spitting out codes 
118000 mi Wish someone had told me that the balance shaft gear was a problem. $7,000 tab that I cannot afford. Parted out the car. 
110000 mi

US $1000
waterpump 
91000 mi

US $1400
Cam magnets replaced 
42000 mi Cam shaft sensor went bad. 
44300 mi

US $937
Fuel pump seal cracked 
71500 mi Check engine light came on. Car idled rough. They Removed and Replaced the Intake manifold. Check Engine light came on. It was diagnosed as a bad Catalyst. Covered by emissions warranty. Feel that intake was cause, but MB won't admit to this, as intake would then also fall under emissions warranty. Upon test drive for the other problem, it was found to be "missing." A computer malfunction caused the misfiring, which caused the cat to pack up. 

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2006 Mercedes-Benz C-Class 4dr Sedan

supercharged 154hp 1.8L I4 6-speed manual RWD

102300 mi

R 2000
teeth stripped of the cam chain. replaced chains, and cams 
110980 mi

R 150
tensioner and idler pulley 

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2006 Mercedes-Benz C-Class 4dr Sedan

362-horsepower 5.4L V8 5-speed shiftable automatic RWD

121000 mi

US $100
Leak in expansion tank and auxiliary coolant pump. 

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2006 Mercedes-Benz C-Class 4dr Sedan

228-horsepower 3.0L V6 7-speed shiftable automatic RWD

54000 mi the accelerator on the vehicle suck at 50+ miles per hour... vehicle crashed and was not repaired 

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2006 Mercedes-Benz C-Class 4dr Sedan

228-horsepower 3.0L V6 5-speed shiftable automatic AWD

45300 mi

US $300
Broken transmission mount repaired 
51000 mi

US $99
Fuel injection needed tune up and recalibration. Problem discovered when Check Engine Light came on 
124000 mi Ignition coil in cylinder 1 failed causing a misfire. P0301 and P0351 codes appeared. After restarting the car, codes and misfire went away. Planning to replace the coils and plugs. 
64000 mi

US $1284
Fuel Pump failure. Replaced, no solution. Fuel Sensor broken and replaced. 
71700 mi

US $105
Transmission malfunctioning, hard shifts, high revving. Fuel System Software update/reflash needed. 
75000 mi

US $500
CEL on, replaced right intake solenoid. 
78000 mi

US $1000
Balance Shaft Sprocket Problem. Est. cost over $10000. Past warranty, MB and dealer offered to pay all above $1000 because known problem. 
109300 mi

US $130
CEL came on. Happens after traveling on highway then coming to stop. Gas tank sensor shows vapors escaping. CEL was cleared, no problem found, but CEL continues to be on. 
125700 mi

US $850
Coolant system leak deep in the engine, replaced pump, thermostat and a few other things. 
133500 mi

US $200
Small idlers were making noise, didn't need to be replaced, but such a small job, replaced them. 
139000 mi

US $1600
Gasket at crank shaft leaking oil. Transmission needed to be taken out to replace the gasket--95% labor costs. 
156000 mi

US $330
camshaft sensor replaced 
63000 mi

US $150
thermostat stuck open and wife noticed the check engine light. It took a while to find the part from a non dealership. 
101000 mi

US $300
Canister vent valve replaced.  

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2006 Mercedes-Benz C-Class 4dr Sedan

201-horsepower 2.5L V6 7-speed shiftable automatic RWD

89000 mi

US $1400
fourth time car misfired in two year blowing coils and destroying intake. 
27000 mi Service Campaign 025966 - Replaced whining guide pulley for V-belt 
52000 mi

US $125
Check engine light on while driving. Took car to a private Benz mechanic. Paid $125 for a diagnostic. Emission System Repair estimated at $1150. 
76000 mi Yet another $700 mechanical expense that was "probably" going to fix the problem. If this did not fix it, a total rebuild would be required. Car traded in. 
38000 mi Balance shaft drive gear came apart. Engine and tranny needed to be pulled from car and front of engine dissembled for gear to be replaced. Bottom oil pan needed to be removed and cleaned of broken gear parts.  
62000 mi

US $100
Poor idle 1 week after changing air filters. CEL came on for p170 & p0173 codes. MAF was cleaned to resolve the issue. 
91000 mi

US $6
Check engine light came on. Returned a code for the MAF. Pulled MAF and cleaned it with MAF cleaning fluid. Problem resolved and reset the check engine light and it hasn't returned. 
53000 mi

US $194
CEL coolant temp would not rise to operating temp, remained below 80C. Purchased thermostat and coolant from dealer and installed myself. CEL went out in two days. 
84000 mi Vacuum hose split near the throttle body threw a CEL. Apparently happened at the dealership when they replaced the plastic engine cover. Delivered to me house with CEL! 
61000 mi

US $100
1-CAMSHAFT ERROR - DUE TO FAULTY HARNESS COVERED BY MB 2-THERMOSTAT COVERED BY EXTENDED WARRANTY 
37300 mi

US $284
Engine check light: Replaced right intake and right exhaust camshaft solenoids. 
64000 mi

US $45
Replaced spark plug and 1 coil pack that failed. 
98000 mi

US $1200
Needed balance shaft replaced Dealer replaced 4 camshaft positioners. 
108000 mi

US $75
Thermostat and coolant 
52000 mi

US $90
plastic breather at the rear of the head right by the cabin filter(o-ring was flat, but only sells with new cap), was leaking oil on to the cat, sometimes smoking at a stop and it smelled in the cabin even on recirculate. 

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2006 Mercedes-Benz C-Class 4-door

turbocharged 4-cylinder diesel manual 2WD

151900 mi

$400
2 engine motor mounts 

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2006 Mercedes-Benz C-Class 2-door

6-cylinder automatic 2WD

52700 mi

C $775
Injection air pump in emission system 
69440 mi PISTON/RINGS AND CYLINDER SCRATCHES. NEED ENGINE REPLACED 

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2005 Mercedes-Benz C-Class

Engine not specified

117000 mi

US $175
EGR value went bad 

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2005 Mercedes-Benz C-Class 4dr Wagon

168-horsepower 2.6L V6 5-speed shiftable automatic AWD

50840 mi water disappeared from radiator...faulty pump, improperly diagnosed on previous visit to dealership 

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2005 Mercedes-Benz C-Class 4dr Sedan

supercharged 189hp 1.8L I4 6-speed manual RWD

42000 mi

US $75
Fuel pumps were replaced, out of pocket cost $75, total repair bill $1500. 

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2005 Mercedes-Benz C-Class 4dr Sedan

supercharged 189hp 1.8L I4 5-speed shiftable automatic RWD

85000 mi

US $100
Replace camshaft magnets as they were leaking oil. 
92000 mi

US $100
The alternator one way pulley was frozen. I replaced it. 
61000 mi Vacuum hose bulletin, with some seals. 
67000 mi M-B dealer replaced the transmission control module. Persistent reports of sluggish shifting on the SSk variant apparently prompted this. Appears to be the subject of a TSB or "for cause" event. Replaced at no charge to us, while in for an oil change. 
158000 mi

US $2500
camshaft sprocket failed. 
57000 mi

US $555
needed hose for intake hose cost 28.00 but removal of trottle body etc to replace hose labor cost was $500.00 
79600 mi

US $2000
Vapor leak at gas tank neck repaired. Oil leak repaired. 
86000 mi

US $600
Alternator pulley causing tensioner to vibrate; replace pulley and vbelt. 
51000 mi Thermostat was stuck open 
57000 mi Vacuum pump seal leaking oil on engine right side 
64000 mi Check engine light and poor performance initiated visit. Service Campaign indicated that solenoid oil leaks were cause. Completed service campaign and replaced parts and car is good. Unrelated but had to replace battery this month. 
115300 mi

US $170
transmission mount bad R&R part $70, labor $100 
137000 mi

US $235
miss in engine when starting. adj. mass air. 
3500 mi engine seal leaking 
24000 mi Roaring noise coming from rear of car while accelerating. Dealer initially unable to replicate, later through thorough vibration sensor exam found that the rear transmission mount had broken. 
46000 mi The check engine light came on, I took the car to the dealer. They told me it was a loose gasket, but that a recall had been ordered on it, so they were going to order the part and repair it when the part arrived. She is scheduled to go back in the 30th 
75000 mi Check engine light, loss of fuel pressure. Couldn't find leak, reset light. 
85000 mi

US $1000
Check engine light, loss of fuel pressure. Leak in fuel filler neck, needed to smoke test and replace neck and seals. 
95000 mi

US $300
Cooling system thermostat. Magnetic Camshaft Sensors leaking oil. 
31000 mi CEL on. Traced to leak in fuel filler neck. Replaced under warranty. 
36000 mi Transmission connector leaking. Replaced. Transmission mount collapsed. Replaced. Warranty ends. 
101000 mi

US $430
Thermostat failure.. replacement part was $28 and labor was $100. The rest was other maintenance.  Thermostat failure.. replacement part was $28 and labor was $100. The rest was other maintenance.  
130000 mi

US $300
Engine mounts replaced 
113000 mi

US $50
Oil leaking, replaced valve cover gasket. 
113998 mi

US $150
Oil vac pump 
123000 mi

US $80
Cam magnet sensors replacement. They were leaking oil. 
48000 mi Bad temp sensor - replaced. 
75000 mi

US $878
Oil leak from Vacuum Booster, replaced. Tranny oil leak from sensor, sensor replaced. 
88000 mi Cam sensor replaced under recall. minor seeping of oil was noted. 
57000 mi

US $150
Cam magnet sensor leaking. 
84000 mi

US $100
Thermostat 
32736 mi combustion chamber event (service campaign) direction thrust arm replacement (warranty) 
40300 mi  
79000 mi

US $2009
Cel on for thermostat.  Vacuum leak. Fuel filter replaced. Spark plugs. Battery. Alignment. Wipper blades. Service B. 
54900 mi

US $20
Replaced thermostat 

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2005 Mercedes-Benz C-Class 4dr Sedan

supercharged 154hp 1.8L I4 5-speed shiftable automatic RWD

77820 mi

$50
The M271 engine has problems with carbon buildup in the valves for two reasons: 3-hole injectors and engine oil vapors. At the moment I 'm trying to burn the carbon with a fluid added to the intake. 
86800 mi

$400
change radiator 

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2005 Mercedes-Benz C-Class 4dr Sedan

362-horsepower 5.4L V8 5-speed shiftable automatic RWD

106000 mi

US $550
emissions air injection pump went out 
106000 mi Replacement air injection pump for emissions control failed after a month, replaced again. 
90000 mi

US $2800
Replaced crank sensor Repaired several oil leaks 
102200 mi

US $780
Replaced Mass Airflow Sensor 
123360 mi

R 1000
Engine & Transmission mounting changed,  
130180 mi

R 700
Water Pump change 
86832 mi

US $160
Engine wouldn't turn over and oil was about 2 quarts low. Filled up oil until oil level OK and drove to shop. A new crank position sensor was needed. Repair was two hours labor. 
55000 mi same problem after driving it for 1 day 

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2005 Mercedes-Benz C-Class 4dr Sedan

215-horsepower 3.2L V6 5-speed shiftable automatic AWD

93000 mi

R 4700
Oxygen sensors. 
140520 mi

R 10000
Fan Broke 

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2005 Mercedes-Benz C-Class 4dr Sedan

168-horsepower 2.6L V6 5-speed shiftable automatic AWD

125000 mi

US $436
Crank sensor replaced, and valve cover gasket replaced 
147137 mi

US $298
Camshaft position sensor replaced 
169508 mi

US $817
REPLACED BOTH VALVE COVER GASKETS Smelled oil - Replaced both valve cover gaskets 
174300 mi

US $733
Replaced all three engine mounts. Straightened a rim Engine felt rough, Motor Mounts needed replacing. New MB OEM Motor Mounts installed 
174937 mi

US $538
Water Pump replacement Water pump replacement 
185200 mi

US $259
replace oxygen sensor Engine light came back on after a few days. Replace EGR Valve, cleaned EGR tubes 
185300 mi

US $603
New valve cover gaskets 
222209 mi

US $455
Transfer case service twice flushed with new fluid, transmission mount, oil change 

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2005 Mercedes-Benz C-Class 4-door

4-cylinder manual 2WD

41540 mi

$300
car is sometimes using only 3 cylinders out of 4 

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2005 Mercedes-Benz C-Class 2dr Hatch

supercharged 189hp 1.8L I4 6-speed manual RWD

57350 mi

C $55
Added Adapter cables MB #2711502733 to camshaft sensor cables to prevent oil leaking into the wiring harness. Added Adapter cables MB #2711502733 to camshaft sensor cables to prevent oil leaking into the wiring harness. 
71500 mi

C $50
Replace thermostat and upper radiator hose. 
21000 mi CEL light came on, diagnostic was coolant thermostat needed replacement. Part ordered from Germany, arrived a week later, car now fixed (1+1 days total) Installed new thermostat. 

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2004.5 Mercedes-Benz C-Class 4dr Sedan

supercharged 189hp 1.8L I4 5-speed shiftable automatic RWD

114700 mi

A $12550
Engine timing chain went, destroying motor. 
244400 mi

A $6573
Timing chain broke again. 

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2004 Mercedes-Benz C-Class 4dr Wagon

168-horsepower 2.6L V6 5-speed shiftable automatic AWD

72200 mi

US $500
replace faulty crankshaft position sensor which was causing stalls and failures to start when engine was shut off warm. 

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2004 Mercedes-Benz C-Class 4dr Sedan

supercharged 349hp 3.2L V6 5-speed shiftable automatic RWD

111000 mi

US $243
The car was not picking up speed like it was suppose to. The valcum was clogged up. 
134000 mi replace thermostat 

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2004 Mercedes-Benz C-Class 4dr Sedan

supercharged 189hp 1.8L I4 6-speed manual RWD

62000 mi

C $180
Cam solenoid magnet was leaking into the wiring harness, a common problem with this car. Replaced solenoid along with OEM modification of isolation wires to stop migration of oil to ECU and O2 sensors to prevent serious damage and expense 
63240 mi

C $65
bought coolant temp sensor as there is an intermittent warning when the outside temp goes below -10. Will install when I have time in the summer 
65720 mi

C $22
Replaced temperature sensor that controls the cooling fan and sending the temp to the instrument panel. Was giving me an error message in cold weather 
66340 mi

C $15
bolts holding exhaust system to the catalytic converter broke when hitting a puddle, it was determined that they prematurely rusted out to be less then a quarter in diameter then spec 
75940 mi

C $201
replace upstream O2 sensor as it was sending an error code 

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2004 Mercedes-Benz C-Class 4dr Sedan

supercharged 189hp 1.8L I4 5-speed shiftable automatic RWD

97000 mi

US $1250
Replace fuel pump and fuel level sensor. 
120000 mi

US $300
Noise from kompressor. Service B. 
53000 mi

US $400
The thermostat need to be replaced. The dealer quoted US$535, did not repair @ the dealer. Instead, we bought the part online ($30), and asked a independent mechanic to replace it for us ($100). Service B cost $300 
113000 mi

US $564
Check engine light came on, exhaust issue corrected, new gas cap put on. 
77000 mi

US $900
Supercharger starting to make noise. Was advised it needed replacement, common problem on this car. Cost would be over $2500. Will schedule replacement in next 30 days. Update 0415: never replaced, still running fine. 
107700 mi

US $1926
Battery/alternator/ESP warning lights came on multiple times when starting after car sat for 24 hours or more. Also sounded "diesel like" Replaced: Alternator clutch pulley, a/c compressor/drive belt/oil/freon. Corrected dieseling noise. 
48000 mi

US $183
Check engine light came on. Replaced thermostat. 
49000 mi

US $56
Air intake hose coming apart. Common issue on these cars. New air hose ordered and replaced. 

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2004 Mercedes-Benz C-Class 4dr Sedan

215-horsepower 3.2L V6 5-speed shiftable automatic AWD

138260 mi

C $400
Replaced injectors 
173600 mi

C $300
Evap valve 

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2004 Mercedes-Benz C-Class 4dr Sedan

168-horsepower 2.6L V6 5-speed shiftable automatic RWD

154000 mi

£1200
Turbo and catalytic convertor replaced 2005 and again in 2008 

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2004 Mercedes-Benz C-Class 4dr Sedan

168-horsepower 2.6L V6 5-speed shiftable automatic AWD

74000 mi

US $700
maf replaced maf replaced 

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2004 Mercedes-Benz C-Class 4-door

4-cylinder automatic 2WD

76880 mi

C $306
Check engine light came on and car idled really rough after stopping and putting it into park. Diagnosed as a misfire by MB. Changed spark plugs. Problem persists and now the car has to go back in. 
76880 mi

C $285
Problem persists with engine misfiring. Problem could not be diagnosed by mechanics. Car was picked up and traded in at a very low price because pending repairs were disclosed. Bought a new BMW X1 which is great! 

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2004 Mercedes-Benz C-Class 2dr Hatch

supercharged 189hp 1.8L I4 5-speed shiftable automatic RWD

95000 mi Huge issue with oil leaking out the camshaft sensor, down the wiring harness to short out coolant and O2 sensors. All sensors and harness repaired under extended warranty - oil was found all the way to the ECU. 
108000 mi

US $300
A misfire diagnosis via the check engine light lead to the replacement of a coilpack and a sparkplug. Repair has fixed the problem. 
122200 mi

US $400
Check engine light with multiple odd causes, believed to be tied to MAF sensor or something else. 
123000 mi

US $800
MAF meter was replaced, computer was reset which ultimately corrected the check engine light. 
96000 mi

US $80
oxygen sensor and air filter change. 
98000 mi

US $500
Thermostat 

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2003 Mercedes-Benz C-Class

Engine not specified

82000 mi Engine idle and drive fluctuating. 
125000 mi Too many things wrong. Most recently an engine coolant leak. Probably going into the cylinders, so maybe a head gasket leak. 

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2003 Mercedes-Benz C-Class 4dr Wagon

215-horsepower 3.2L V6 6-speed manual RWD

64480 mi

C $350
Replace o2 sensor 
66960 mi Check Engine light - result was new Catalytic Converter installed. Parts and labour covered by Mercedes at 65,000 miles. (108,000 kilometers ) Guarantee is for 8 years and or 80,000 miles. 
71300 mi

C $1100
Rough idle when cold and minor roughness felt through steering a certain speeds. Engine mounts replaced. Car is running well again. 
78120 mi

C $2000
A small module that helps to start the car. 
80180 mi

C $395
Cable to spark plug number four not working. 
81320 mi

C $1485
Worst rainstorm in Toronto last week since Hurricane Hazel in 1954. Rain got into the ECU (engine computer)and the car wouldn't start. $400 diag from dealer, but they wanted $4746 for the repair. Got reconditioned ECU for $775 + $160 for overnight. 

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2003 Mercedes-Benz C-Class 4dr Wagon

168-horsepower 2.6L V6 5-speed shiftable automatic AWD

18322 mi Control Module 

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2003 Mercedes-Benz C-Class 4dr Sedan

supercharged 349hp 3.2L V6 5-speed shiftable automatic RWD

62000 mi Supercharger bearing was bad. Replaced belt at the same time. 
84000 mi

US $200
Replaced all radiator hoses and intercooler pump. 
249000 mi Blew my timing chain and destroyed engine. To expensive to fix and not worth fixing at this point. Will probably donate or sell the car for parts. 

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2003 Mercedes-Benz C-Class 4dr Sedan

supercharged 189hp 1.8L I4 5-speed shiftable automatic RWD

23560 mi Accelerator pedal not working properly - not responding to kick-down acceleration. Parts replaced under warranty. 
26040 mi Accelerator pedal not working properly, again not responding to kick-down acceleration. Problem localized to fuel injectors, which requires major engine work. Service appointment booked. 
26660 mi Engine repair (under warranty) for fuel injectors not working properly. 
61687 mi

US $177
apparently there was an oil leak 
68306 mi

US $2186
Cylinder 3 would misfire randomly(mostly during idle) and cause engine to convulse. work around was to increase idle rpm to >1k. 
90751 mi

US $34
Oil leaking from the top of the engine most likely from the oil cap. Gasket replaced. 
92656 mi

US $79
Secondary O2 air sensor failure. Replaced sensor. 
136672 mi

US $1235
Fuel pump failure. replaced fuel pump 
44000 mi

US $85
Car lost power,stuck in high gear(automatic),then CEL came on.Car was serviced by dealer since new,wanted more $ to just take a look than I'm willing to pay. Found dirty air filter myself(looked never replaced),replaced & clean AMS, fixed! 
49300 mi

US $1500
one of the hoses or pipes was cracked & caused the check engine light to turn on. 
39460 mi two small vacuum pipes running under engine plastic cover. The pipes had cracks due to age and heat 
73780 mi Replaced camshaft magnets to prevent oil leaks 

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2003 Mercedes-Benz C-Class 4dr Sedan

215-horsepower 3.2L V6 5-speed shiftable automatic RWD

54000 mi

US $125
Replaced crankshaft position sensor after car stalled. 
81000 mi

US $470
Replace water pump. 
83900 mi Replaced main radiator hose that is leaking. 

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2003 Mercedes-Benz C-Class 4dr Sedan

215-horsepower 3.2L V6 5-speed shiftable automatic AWD

55000 mi

US $400
One bad coil pack was replaced and all spark plug wires were replaced. 

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2003 Mercedes-Benz C-Class 4dr Sedan

168-horsepower 2.6L V6 5-speed shiftable automatic RWD

74000 mi Slight vibration - motor and transmission mounts replaced. 
85300 mi

US $450
Left catalytic converter 
99000 mi Crankshaft Position sensor replacement 
118000 mi

US $359
replaced a catalytic converter (rebuilt) 
141500 mi

US $275
car starts after several times try..check engine light on; diagnostic function test; faulty crankshaft position sensor. replace with new. 

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2003 Mercedes-Benz C-Class 4dr Sedan

168-horsepower 2.6L V6 5-speed shiftable automatic AWD

109000 mi Shop damaged sensor while repairing starter. Reset code, but it returned. Shop replaced for no charge. Works as intended now. 
156000 mi

US $380
Crankshaft alignment sensor was replaced by Midas ($380.00) because the dealership wanted $950.00 to do the same thing. 

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2003 Mercedes-Benz C-Class 4-door

turbocharged 5-cylinder diesel automatic 2WD

166160 mi

€180
broken gasoline line (from filter to pump) 

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2003 Mercedes-Benz C-Class 2dr Hatch

supercharged 189hp 1.8L I4 6-speed manual RWD

63000 mi

US $150
Check engine light. Downstream O2 sensor. 
65000 mi

US $500
Check engine light. Upstream O2 sensor. 
81000 mi

US $1600
cracked oil filter cap 
107880 mi

C $326
Oxygen Sensor replaced, upstream sensor. 
117800 mi

C $1050
Bolts and flange repaired 
125240 mi

C $55
Check Engine light, code turned off Check engine light reappeared, replaced downstream O2 sensor, turned light off, additional cost $277 
132260 mi

C $660
Check Engine light on, this is multiple times for this issue, seems difficult to diagnose. 
133300 mi

C $49
Another Check Engine light, light reset, seems to be air related, or fuel EVAP, Very frustrating. 
133300 mi

C $465
Check engine light, to do with threshold being reached one time on oxygen sensor 
53940 mi

C $960
Cracked intake box after the MAF. Still don't know how it happened, was throwing the computer into fits. Over work the O2 sensors - so they failed. the box had to come from germany hence the long down time. 
118000 mi

US $2000
Timing chain stretched and intake cam adjuster failed. 
118000 mi

US $3000
Timing chain stretched and skipped causing valve damage. The head, timing chain, timing chain tensioner and the one of the guide rails was replaced along with one of the cam adjuster magnets. Also replaced coolant pipes (since in there) and vacuum lines (had failed). 
120700 mi

US $40
Upstream Oxygen sensor went bad. CEL and pulled codes. 
152000 mi

US $45
Replaced coolant reservoir and cap. They were both showing signs of starting to fail. The edges of the reservoir were starting to show signs of the plastic checking and drying out and the system was losing pressure. It wasn’t actually leaking yet, but, the cap was releasing steam prematurely and the coolant level was dropping (although there weren’t any visible drips or puddles under car). 
93620 mi

C $800
Check engine light coming on due to thermostat. 

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2003 Mercedes-Benz C-Class 2dr Hatch

supercharged 189hp 1.8L I4 5-speed shiftable automatic RWD

122500 mi

US $900
Belt tensioner failing. Replaced unit and belt 
162500 mi

US $600
Check engine light. Discovered a cracked hose under intake manifold. 
88040 mi

C $2000
Went in for an oil service, turned out there was a leak at the cam cover where oil got into the wiring harness damaged (though still working) some of the emissions equipment (EGR solenoid). 
103540 mi

C $600
sensor malfunction. Wrong trouble code. Dealer resolved.  
111600 mi

C $1800
Check engine light came on. Replace oxygen sensor, EGR valve, control module. 
104160 mi

C $1200
Replaced EGR valve, EGR control module. Is feeling ripped off as car was in for full service inspection 2 months ago at $1100.00 Replaced O2 sensor. 
137600 mi

C $1200
I am annoyed that CEL came on and an O2 sensor needed to be replaced 2 weeks after I spent $1800 for a full service at MB. MB charged to redo everything they did 2 weeks ago. 
53940 mi

C $3700
Cam shaft seal leak caused oil to enter the electrical system compromizing the ECU, MAF, O2 sensors & wiring harness... recall in the USA but not recognized in Canada. mercedes Canada covered 50% of parts no labor. Coolant line leaking into the transmission, another known problem by mercedes yet no Canadian recall. radiator was repaired and transmission was tripple flushed, Transmission will now soon have to be replaced 1,2 clutch (auto) is toast. 

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2003 Mercedes-Benz C-Class 2dr Hatch

215-horsepower 3.2L V6 5-speed shiftable automatic RWD

82000 mi Oil was leaking from under engine....was told a seal had broken...the dealer repaired it...leaked the next day.....repaired it again..has not leaked since-- 

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2003 Mercedes-Benz C-Class 2dr Hatch

78000 mi

US $2000
Small fuel leak, could smell in the cabin 

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2002 Mercedes-Benz C-Class

Engine not specified

77500 mi

C $450
Oxygen sensor and one of the rear turn signal bulbs had to be replaced. 
116500 mi

US $300
valve gasket needed replacing 

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2002 Mercedes-Benz C-Class 4dr Wagon

215-horsepower 3.2L V6 5-speed shiftable automatic RWD

85200 mi

US $120
Replaced the serpentine drive belt and belt tensioner (which was making some minor noise). 
-Fuel pump electr fault -Brake lamp tailamp unit cont -oil leak -ps pump hyd -tighten fr door lock -engine mount fr/too weak 
-ignition housing where key is inserted 
-MAF Sensor 
176000 mi

US $1500
Fuel pump 
42036 mi

US $850
Replacement of engine gaskets. The beginning of a period of moderate restoration. I acquired this car from a dealer knowing it to be in need of a substantial but unknown amount of repairs. So far, I'm getting off easy. Replacement of engine gaskets. The beginning of a period of moderate restoration. I acquired this car from a dealer knowing it to be in need of a substantial but unknown amount of repairs. So far, I'm getting off easy. 
46000 mi Leaking rear seal repaired 
81900 mi Fuel fill/overflow evaporator. Not totally fixed despite multiple trips to replace the evap Valve and associated hoses. Engine runs fine. Mechanic suspects valve is just slow, largely irrelevant to the functioning of the engine and not worth further cost. 
96700 mi Check engine light came on. Nothing done yet. Apparently, it relates to some filter that's starting to go. It'll be replaced at the next major service (100000), probably in January.  
105000 mi

US $175
Replace rear trans mount 

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2002 Mercedes-Benz C-Class 4dr Sedan

supercharged 349hp 3.2L V6 5-speed shiftable automatic RWD

86800 mi

A $1100
noisy pulleys Misfiring after spark plugs 
93900 mi

A $700
Burst radiator hose, damaged thermostat 
101000 mi

US $200
Replace intercooler pump - replaced with F150 SVT pump. 

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2002 Mercedes-Benz C-Class 4dr Sedan

215-horsepower 3.2L V6 5-speed shiftable automatic RWD

146600 mi

US $340
Leaking water pump. Replaced water pump, found a new Hela water pump replacement for $100 on the internet and my local mechanic replaced it for $240. Total cost $340. 
124000 mi

US $140
Replaced driver side exhaust sensor (before the cat).  

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2002 Mercedes-Benz C-Class 4dr Sedan

168-horsepower 2.6L V6 5-speed shiftable automatic RWD

56000 mi Driver side catalyst was replaced. 
96000 mi

US $500
Driver Side Catalytic converter was replaced. 
64000 mi Oil recirculatory cover leaks, other oil leaks. 
64000 mi Sold car after quoted quadruple digits to repair a severe misfire. 
124000 mi

US $350
Replace MAF, Gasket at MAF, MAF adapter, gasket between MAF adapter and throttle body Pax side breather cover on valve cover leak, oil leaked onto wires, so replaced all 12 wires and spark plugs 
155000 mi

US $105
Replace 2 injectors 
87000 mi A variable valve timing sensor that rides close to camshaft contacting the cam shaft. Tapping sound that might have diagnosed by some mechanics as loose timing chain. Checked my timing chain, found no issue. All sources point to $1400 camshaft repair.  Needed new valve cover gaskets. 
31700 mi

US $45
Car misfired while driving. May have been bad gas. After repair shop cleared DTC, no more problem. 
60000 mi

US $45
Replaced faulty crank shaft position sensor. 
92000 mi

US $45
Belt tensioning pulley broke and was replaced. 
94000 mi

US $260
Replace valve cover seals, vacuum hoses, spark plugs 
117000 mi

US $230
Replaced the coolant thermostat 
120000 mi

US $40
Broken idler pulley and serpentine belt were replaced 
146000 mi

US $20
Replaced serpentine belt 
59203 mi Warranty replacement of ignition cables. 
87068 mi

US $64
Replace both valve cover gaskets. 
92255 mi

US $295
Car would crank but not start. Problem was intermittent. Check Engine light activated after first non-start episode. Faulty crankshaft position sensor replaced. Replace failed crankshaft position sensor 
98700 mi

US $150
Replaced idler pulley for serpentine belt. Pulley was beginning to crack and mechanic discovered the issue while performing routine Service B maintenance. 

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2002 Mercedes-Benz C-Class 4dr Sedan

97960 mi

$60
There has been a slow coolant leak the last month and on further investigation saw the leak was from the water pump which I replaced. Thank you 

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2002 Mercedes-Benz C-Class 2dr Hatch

supercharged 192hp 2.3L I4 6-speed manual RWD

75000 mi Rattling noise coming from engine on startup. Replaced timing chain tensioner and camshaft adjuster.  Fuel leak from the injection rail. Replaced some small part (I think pressure regulator) that leaked.  
59000 mi

US $380
Replaced electrical connector to cam position sensor 
230000 mi

US $153
Check engine code indicated problem with secondary air injection valve. Replaced both Secondary Air control valve and check valve 
18600 mi Variable camshaft tensioner, on warranty 
52080 mi

C $30
PCV and Hose degraded and causing leaks 
57440 mi

C $120
Changed tensioner pulleys 
64480 mi Magnetic Cam sensor leaking, change out with new OEM. Gasket bonded to the block with magic German sealant. Hint: Apply heat with chisel. 
65720 mi Oxygen sensor 
70680 mi

C $114
EGR valve failed. Very hard to do the first time. 

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2002 Mercedes-Benz C-Class 2dr Hatch

supercharged 192hp 2.3L I4 5-speed shiftable automatic RWD

112000 mi

US $1366
1 of 2 fuel pumps (located inside gas tank) failed. Had car 10 days. Returned for additional 7 days, could not duplicate my report of continued poor gas mileage. Reset computers - working now. Had loaner, no problem. 
124000 mi

US $2200
Blown head gasket. Coolant light came on - was leaking coolant at right rear of engine. Did not mix oil and coolant. 
126700 mi Oil leak. Determined supercharger is leaking. Declined repair. I feel this is related to alt change. Driving home after alt changed, burning oil smell. Never happened until alt was changed. Suspicious coincidence. Shop says no. 
130200 mi

US $447
OIL, not antifreeze dripping. Told me I need a new water pump. Also want $1800 to fix various hoses/leaks, 'none major' or in imminent failure! Car smelled so bad it was going back yesterday, but ultimately didn't. My son will look at it. Was told in August that my super-charger was leaking and needed to be replaced at $2300. Car in for oil and brakes 12/31/13, super-charger 'fine, no leaks or problems'!!! Miraculous recovery I guess 
141000 mi

US $350
Cat converter replaced Both engine and one transmission motor mounts were replaced 
51000 mi

US $265
Replaced Radiator Fan Assembly; Controller Unit damaged by antifreeze that dripped down the power cables--found a pool of it inside the unit. Unknown source. Replaced Radiator Fan Assembly; Controller Unit had received water damage from antifreeze that dripped down the power cables. 
81000 mi OBDII code scanned. EGR Check valve cleaned and reinstalled. 
105000 mi

US $70
Motor Mounts 

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2002 Mercedes-Benz C-Class 2dr Hatch

71920 mi

A $34
after air/con re-gas car developed multiple abnormal engine noises & Altenator Warning Message> Checked with OBD 11. reading " air con excessive torque " > return to shop for fix Now seemed OK (not advised what was done ) At next startup Excessive Noise ( Radiator Fan Running ??from cold ??) Check Coolant Temp;Sensor > meter Reading wrong + Plastic part sensor of completely cracked (no leak ?) eventually replaced sensor $8 from C now normal ( suspect gas in aircon was excessive. 

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2002 Mercedes-Benz C-Class 2-door

Engine not specified

70000 mi

US $100
Secondary Air Injection check valve 

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2001 Mercedes-Benz C-Class

Engine not specified

104160 mi water got under the hood, flooded and killed most electrical components (front SAM, etc) 

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2001 Mercedes-Benz C-Class 4dr Sedan

turbocharged 114hp 2.1L I4 Diesel 6-speed manual RWD

227540 mi

€5000
Leaking turbo destroyed intake manifold, both needed to be replaced 
227540 mi

€200
Car warming slowly, main thermostat needed to be replaced along with the small thermostat for heater booster 

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2001 Mercedes-Benz C-Class 4dr Sedan

215-horsepower 3.2L V6 5-speed shiftable automatic RWD

116560 mi

$58
Broken idler pulley. Changed pulley and serpentine belt. 
43400 mi

C $600
fix catalytic converter 

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2001 Mercedes-Benz C-Class 4dr Sedan

168-horsepower 2.6L V6 5-speed shiftable automatic RWD

34750 mi

US $1050
Replace front SAM module because car will not engage the starter motor. Replace battery 
63000 mi

US $1676
Crankshaft position sensor. Transmission fluid service 

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1999 Mercedes-Benz C-Class 4-door

8-cylinder automatic 2WD

140000 mi

US $1800
Exhaust corroded. Had to wait for replacement from Germany. No aftermarket parts available 

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See TrueDelta's information for all Sedans, Wagons, Coupes, and Convertibles.
See TrueDelta's information for all Mercedes-Benz models.

Mercedes-Benz C-Class Engine Problems

See our lemon odds and nada odds page to see vehicles with no repairs or vehicles with more than three repairs. To see how frequently Mercedes-Benz C-Class problems occur, check out our car reliability stats.