Check Coolant warning light two days in a row at startup. Drove into the dealership service bay, reported the problem, they topped-up the coolant reservoir with factory-specified coolant and we were on our way.
A "Check Engine" light came up. Problem traced to the fuel cap sensor. It was resolved (not sure what was done - probably fault codes reset only.
Have had severe fuel pump problems that have caused to cease while driving at high speeds; Morristown MB unable to rectify after 4 attempts including replacing fuel pump; Open Road Bridgewater repaired in one day.
engine was leaking oil around the oil separator seal at the turbo charger port. seal needed replacing.
turbo intake seal leaking, had to order part turbo intake seal replaced and oil spillage over engine was cleaned up now turbo oil separator seal leaking oil down side of engine onto exht. pipe Heat shield and exhaust particulate filter rattling and leaking exhaust.
engine oil cooler broke, leaking oil, effect: rising engine heat and yet another mess on the garage floor from the most unreliable and problematic vehicle I have ever ever owned!
The car was losing power. I thought it was another fuel pump, but it turned out to be some sensor.
White Smoke Billowing out of car on highway. Resolution was it was a routine active particulate filter burn - with NO notification to the driver - thought my car was burning up or a blown head gasket.
Replace all Glow Plugs The "computer" now says the glow plug conrol module needs to be replaced for $400 just a week after I replaced all of he glow plugs for $900
Leaky oil tube and diesel fuel line
Power door locks went out, O rings on engine leaking
Replaced oil cooler seals as preventative as they began to have a slow leak, replace water pump, belt and tensioner, both idler pulleys while I was in there.
Low oil level. Drove to dealer and refilled with no charge.
ABS/Engine warning lights + skidding occurred. Crankshaft sensor faulty and replaced under warranty.
#3 cylinder injector leak. Replaced injector and fuel hose.
Turbo seals leaking.
Fuel line came loose. Was reclaimed and new fuel filter installed.
Replaced motor and transmission mounts.
oil leak from deep in engine. required much labor and seals and gaskets as well as pipe sockets
Previously reported as"repaired" engine oil leak continued. Dealer claimed there was no leak! Would urge anyone buying a this model to have an extended warranty and be ready for frustration.
Glow Plug controller
temp exhaust sensor replaced
2) Oil level sensor needed adjustment to prevent false low oil level indications. No parts needed.
Engine stalled at stop light. Barely started. Drove to dealer next day. Determined to be a crank sensor and was replaced at no charge due to extended warranty.
Rough downshift (repaired under warranty with factory spec computer download)
Fuel pump faulty. Engine shutting off intermittently.
Car loses oil. Recurring problem. Each time I replace lost oil, the oil cap fails and spews oil on engine until warning light comes on.
Small oil leak caused by uninstalled o-ring at the factory.
another leak in engine caused oil to drip onto timing belt, breaking the belt and shutting the engine down on the Interstate Highway. Vehicle hauled to dealer on flatbed for repair.
cam shaft problem reported by check engine light
unknown sensor causing check engine light to illuminate; sensor replaced
Electrical ignition relay replaced. Truck had to be towed on flatbed to dealer.
Leaky oil pump needing full replacement. Also caused damage to servo motors attached to oil pump and other parts.
Honestly I cannot remember the exact repair but it was something either to do with the power steering or ignition system. Cost me another $500.
Replaced fuel pump.
False check oil warnings displayed, despite correct oil level. Oil level sensor and bracket replaced under warranty.
Check engine light and glow plug light illuminated. Dealer found a loose bolt near the glow plug that was creating a short.
Check engine light came on - replaced exhaust pressure sensor.
Check engine light came on and engine died while driving, with loss of power steering. Car had to be towed to dealer, both fuel pumps needed to be replaced. Seems to have resolved issue.
Car was leaking oil due to failed oil cooler. Oil cooler replaced. Exhaust fumes entering the cabin. Replaced faulty exhaust gasket.
Car leaking oil. Oil cooler replaced again.
Car leaking oil again and check engine light on; car in limp home mode. Oil intercooler replaced again and seals replaced.
Oil/Coolant leaking again
M-B insisted on reflash of ECU whenever vehicle appeared in shop. Need for reflash unknown - M-B wouldn't tell.
Improper "check engine oil level at next fillup" message appears often (3-4 time in 70 mi trip). Oil level always OK. Dealer says sensor defect causes message. No new (redesigned) sensors available. Problem is NOT new - 2007 CDI engines often had same ...
False oil level warning appeared sometimes. Oil never low.
C/S Low oil level warning in I/C again. Oil level not too low. Repeat of problem previously 'repaired'. Oil level sensor replaced with sensor with new part number. Oil pan replaced because original oil pan warped when it was removed - too much sealant..
MORE new software updates for rear SAM module. Newer software available and installed on top of new software previously installed. All values and coding checked out correct both before and after update.
CEL on >2 wks. Local indy couldn't diagnose. Dealer found servomotor failed. This servo drives an air door inside intake manifold [provides engine braking?]. Servo was reported to have failed because oil dripped onto shaft, parts seized.
CEL appeared. 1st trip to dealer found that diff pressure sensor at DPF filter failed high. Sensor replaced. Fault would not clear. New DPF ordered. 2nd trip DPF replaced. Same day CEL reappeared. 3rd trip found temp sensor found unplugged during DPF repair and not plugged back in.
Bad oil leak from center of engine rear. O ring seals to oil cooler had failed - a defect known to Mercedes and the subject of a TSB. Dealer replaced seals with new design.
Car stopped without warning while driving. After waiting, car started and ran normally but with MIL set (check engine symbol). Dealer ran diagnostic on fuel system and determined MIL was due to low fuel pressure. Fuel filter was NOT plugged.
Car stalled while driving multiple times. Replaced crankshaft position sensor.
Fuel pump intermittent failure.
Glow Plug Control Module failure. Replaced
Radiator developed a leak and had to be replaced.
Oil sensor was showing low oil even though oil was full. Software reflash solved problem.
Hose on turbocharger blew off in the mountains of Colorado on Mother's Day, forcing my wife to manually-shift the truck (full of kids and dogs) all the way back to the Phoenix area. When I picked it up the next day, it blew off again, but not since.
Turbocharger failed, erratic driving followed by limp mode. This vehicle had the intercooler hose failure three or four times but supposedly that's unrelated. Broken bolts on removal extended repair time (shop broke them).
Complained that trans upshift SOMETIMES did not function as expected given similar load-speed conditions. Dealer diagnosed, "no DTCs, no newer DTC software available, No correction required".
No time to install newer ECU software just available.
Visit to install new ECU software. Software installed. No effect on upshift 'hanging' problem. Dealer test drove w/ instrumentation attached and agreed that "adaptation" settings/results were wrong for transmission. Performed adaptation, no effect on prob
Visit to install another new valve body. Installation/adaptation successful. At this same visit, dealer replaced under warranty the processor card for the COMAND NAV system. System had sometimes told driver to make a 'U-Turn' before destination was reache
new intercooler hose installed per factory directive
turbo intercooler hose becoming detached
turbo intercooler hose issue.
vehicle was bought back by Mercedes on 6/27/2007
towed to dealer, intercooler hose replaced
towed to dealer, fuel pump replaced
CEL was coming on and the car turned off multiple times while driving. CEL would turn off after a day. Took car to dealer. Dealer could not replicate the problem. Nothing was fixed on the car but it does run normally at the present time.
Vehicle intermittantly shuts down. Fuel pump was replaced but it did not solve the problem. Dealer could not find cause of problem. Vehicle traded in.
Serpentine belt broke due to harmonic balancer failing. MBUSA reviewed bill and part on request and paid completely even though out of warranty. It was due to defective part.
Car began running rough, check engine light came on and eventially would not start. New software for engine and transmission computers added.
Engine oil leak cured by replacing three camshaft plugs in cylinder head. False low engine oil warning message cured by replacing oil level sensor.
Replaced crankshaft position sensor Stored code indicated problem with transmission ECM although no symptoms obvious to driver.
Warranty claim- engine check light came on over X-mas Holiday. One cylinder not firing. Dealer replaced overcoil / leads. Problem resolved as of 12/28/07
CEL came on... dealer replaced cam position sensor... 1 week later problem re-appeared... fuel injector replaced... it has been 3 weeks with no issue... problem presumably resolved...
Cylinder head port plug (not spark plug) failed causing oil to leak out. Nuisance defect. Dealer 'repaired' /patched plug while in the interim of getting new parts on b/o. Will repair under warranty
While taking in for PM, I observed a Power steering fluid leak, MB replaced hose / clamp under warranty, problem has not recurred.
Check engine light... looked up code and got a 'fuel too rich' code. Dealer diagnosed problem to be one of the O2 sensors. Replaced under extended warranty...
Took in to fix oil leak. It was in the shop for four days and seamed to go away. Still leaves oil stains in my garage. I will be taking to the shop again for the fourth time this week. Will report the outcome. They did fix the blown speaker.
Still has oil leak. Tire pressure light comes on and tire appears to slowly lose air. I will take the car in this week for the fifth time in three months. Loathe this car.
Loud noticeable thumping engine noise prompted us to take the truck to the dealership and after 60 days (and counting), we are now told that we will get a new engine!
Cam shaft sensor caused check engine light to come on. Dealer replaced sensor.
Camshaft magnet sensor, again, went out. I guess there are 4 total, I have now replaced 3. I'm sure I'll be heading in again one more time.
Intake Manifold tumbler flap Water pump, thermostat, utility belt, pulleys (2x). The thermostat kicked-off the cycle. Once that was replaced, the water pump displayed symptoms, and the rest followed.
Check engine light
Transmission got stuck in one gear and only reset after turning off ignition. Happened three times. They could not replicate or find a fault code but updated the software. Has happened once since and waiting to drive to dealer while it is occuring
Previous problem with transmission. Left vehicle with the dealer and they were able to replicate the problem and fix.
Fuel guage inaccurate. Replaced both fuel senders and fuel pump. Problem fixed.
Cam plugs leaking
Replace Cam Plugs and Centrifuge
Had a minor oil leak on one of the gaskets, not enough to even register low oil.
cam timing sensor replaced under warranty
after rough idle at start up, engine light came on. Diagnosis was bad fuel. Dealer reset light and found no problems.
intercooler hoses replaced with updated versions (diesel engine)
Check engine light came on, GL shut down. Restarted and drove but check engine light remained. Took in next day for service. Part ordered from Germany so Gl sat for 4 full business days before part arrived. New part was fuel rail (diesel).