2008 Mercedes-Benz M-Class Mercedes-Benz M-Class 2008

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2008 Mercedes-Benz M-Class repairs by problem area

Engine (39%)

Transmission and Drivetrain (5%)

Brakes and Traction Control (3%)

Suspension and Steering (17%)

Electrical and Air Conditioning (27%)

Paint, Rust, Leaks, Rattles, and Trim (2%)

Other (7%)

Chart based on 121 repairs.
See TSBs and recalls for the 2008 Mercedes-Benz M-Class.

2008 Mercedes-Benz M-Class engine repair cost distribution

$2500+ (7%)

$1000 - $2499 (12%)

$500 - $999 (21%)

$100 - $499 (28%)

< $100 (33%)

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

Chart based on 43 repair trips. The repair cost chart excludes repairs made under warranty, do-it-yourself repairs, and repair trips that include maintenance.

2008 Mercedes-Benz M-Class 4dr SUV

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

65340 mi

C $950
Engine trouble light. Code stated fuel cutoff solenoid defective / required replacement. Reset it, $125. Factory Warranty not honoured by dealership. Found dealership double dipping on warranty. Charging warranty and customer for same repairs. 
72900 mi

C $455
Fuel cut off solenoid engine error. No output voltage. Solenoid replaced. 
133700 mi

C $3150
Fuel Pump died on trip to Florida. vehicle towed to Jacksonville dealership and repaired. New pump in gas tank, filters, hose. Left dealership and discovered nav, sat & radio not working. Returned to dealership. Improperly flashed computer. 
173600 mi

C $380
Antifreeze leak from small hose located adjacent to lower rad hose. Small hose rubbing against lower rad hose and worn through. No part in warehouse. No aftermarket hose available. Found one hose in Ohio dealership. Shipping delay resulted in vehicle in shop > 1week. 
192820 mi

C $280
Engine error code. Replaced 3 cylinder sensor 
253580 mi

C $850
Oil Cooler Leak. Replaced gaskets and oil cooler 
274040 mi Diesel Emissions recall. Replacement of multip[le sensors, computer programming etc 

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2008 Mercedes-Benz M-Class 4dr SUV

turbocharged 215hp 3.0L V6 Diesel 7-speed shiftable automatic AWD

51700 mi

US $825
Check engine light (CEL)earlier for Temp sensors in emissions, shop cleaned contacts, but CEL returned 2 days later. Since shop could not replicate problem,replaced 2 temp sensors that seemed to be failing, but only on an intermittent basis Aug = a bad month for my "CEL" Sensors! Back again in just 2 weeks for another CEL & Glow Plug warning light briefly illuminating at each startup. Glow plug relay switch was replaced, no issue with plugs. Part was $180, rest was labor/tax 
83000 mi

US $300
Check engine light on. Defective DPF pressure differential sensor. 
64200 mi

US $1000
Oil Cooler Seals - $1,100 (warranty). Engine Belt - $300 (out of pocket). Air Mass Sensor - $610 (out of pocket). 
62000 mi

US $400
Leaky air intake into turbo. Oil leakage at first diagnosed as main seal. Leaky fuel tank seal. Diesel would spill out of tank after filling. Fan belt replaced and Service A performed. 
66000 mi

US $400
MB of Boerne cleared CEL first time indicating it was gas cap lid. Second time stated it was glow plug causing CEL. $~800 to replace. Replaced all six myself, still CEL. Replaced plug controler myself, fixed. Cleared CEL, saved ~$400. Losers 
94000 mi

US $12
Very minor: oil cap has a rubber seal that apparently cracked in the heat and permitted oil to escape up through the cap. Was losing oil at about 1 qt per 300 miles. 
87900 mi

US $900
Faulty glow plug 
87000 mi

US $400
Confusing app 
141000 mi

US $1000
Quoted 3000 for diesel particulate filter replace and 1000 to fix fuel gauge. Skipped both but got 200 fuel cleaner injection . Still has delayed shift but check eng light went out after a week. 
105245 mi

C $101
Replace the Pressure Differential Sensor on the emissions system. The removed part (old part) had a build-up of condensate inside. Not sure if the condensate was the cause of the part malfunction, but the replacing the part fixed the problem of the vehicle going into limp mode when temperatures dropped below -5 degrees Celsius. The whole job took 20 minutes to complete. The vehicle has not experienced the same problem since the part replacement. 
58300 mi rear main seal and turbo seal replaced, apparently common the service manager said 
63000 mi Great vehicle with excellent mileage, comfort and safety. Only negative is the pitiful gaskets used in various places in the engine. Several were replaced at no charge due to extended warranty(expensive). 
73780 mi replace engine oil cooler gasket 
99820 mi

C $2000
replace crankcase vent valve assembly replace intake servo motor replace upper radiator hose 
78860 mi

C $600
replaced leaking fuel filter 
85560 mi Engine leaked 1L per week from rear main seal. 5k in repairs 
69000 mi

US $1470
Intake runner flap motor and related parts. Car was in Limp mode and shifting badly because of that. 
70000 mi

US $800
Fuel pump relay, Car would not start randomly, twice in one month. No fuel pressure. Started after 15 mins. Changed fuel pump relay in position K in rear fuse box. No prob in last 24hrs. Hope that was it. Update: problem returned Replaced fuel pump car now starts and runs fine after 2 weeks, problem is gone. The new pump is an updated version that is self cooling. I believe the original pump generated excessive heat when the fuel level got low. 

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2008 Mercedes-Benz M-Class 4dr SUV

382-horsepower 5.5L V8 7-speed shiftable automatic AWD

65720 mi

C $4500
balance tires, adjust computer for acceleration oil leak 
88040 mi

C $5500
oil filter seal leakage, 

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2008 Mercedes-Benz M-Class 4dr SUV

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

68000 mi

US $125
Oil cover for cams leaked oil. 
120005 mi

US $250
thermostat 
31000 mi Cam seal oil leak repaired. new seal installed 
16120 mi

$550
Coolant leaking from Water pump. New water pump replaced. 
17112 mi

$100
Engine checked and replaced a new solenoid. Engine Check, replaced a new solenoid. 
18600 mi

$400
Fuel pump failure. Replaced new fuel pump. 
80000 mi

US $300
Access pulley and belt was close to failing 
83000 mi

US $1000
leaking gasket New front tires Oil change engine air filter 
76800 mi Fuel pump making noise. Replaced as a precaution. Three weeks later, odor of gasoline in vehicle. Returned to shop for diagnosis and repair. Still with shop. 
79000 mi

US $766
repaired small oil leak @ rear of engine (parts #'s: 272-010-06-31 / 000-998-65-90 / 000-998-56-90) 
98300 mi

US $100
Fan belt broke 

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See TrueDelta's information for all Mercedes-Benz models.

2008 Mercedes-Benz M-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 2008 Mercedes-Benz M-Class problems occur, check out our car reliability stats.