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Vehicle: 2011 Mercedes-Benz E220 with OM651 engine. 300 000 kilometers. Car runs great. No issues at all except EML!
I've had problems since christmas day. Strong diesel smell. When troubleshooting I noticed something wierd between cylinder 2 and 3 on the leak off line (see photo 1). Diesel came out of that whole!
When fiddeling with leak off line in -20C one plastic T-coupler broke. Ordered new after market leak off line. Fitment seemed fine until I did a kickdown. Leak off line came loose!(see photo 2)
Air in fuel system and injector 3 got "airlocked". Towed the car to a authorized dealer in my area. Dealer replaced all 4 injectors to Delphi original and original leak off line. NOTE! This leak off line did not have that extra part between cylinder 2 and 3!
After this job, dealer says car has fault code. P0252. Bad quality control valve (Y94). Replaced Y94 with original part. Dealer does test with xentry and everything checks out except pressure control valve (Y74). The valve does not pass leak test.
I bought a new after market Y74 and changed it myself. Cleaned whole common rail with ultra sonic cleaner aswell. P0088 still does not go away! I take the car to the dealer once again for inspection. They test it with xentry again and still same result. Y74 is leaking according to Mercedes dealer.
As of now, I have 2 fault codes. P0088 (fuel rail/system pressure - too high bank 1) and P025285(Injection pump fuel metering over normal limit). Dealer say they can't help me anymore. They do not now what to do!
I also want to note that the high pressure pump was changed in May last year according to the former owner.
Does anyone here have any tips, or anything!
I would greatly appreciate any help recived.
Photo 1
Photo2
Last edited by lappinator; May 9, 2024 at 12:05 PM.
hello i have the same issue i have mercedes 200a w176 2013 and i think the issue is related to the high pressure pumps regulator if u have solved your issue can u give me any tips thanks. best regards.
Hello! I ended up selling the car with a big loss. Never again a mercedes for me. Only japanese cars.
Next time, as I am sure it will came very soon...try to understand why the dealer told you that the valve you changed is not changeable...Replacing the rail together with the valve is the only way because you can't "calibrate " the valve over the rail.
there is always help at MB regional----go up the chain of command until the problem is solved------plus go back to the dealer who said I cant fix the problem and talk to management---no one else but management
Yeah thats helpful, For one the person already sold the car, second spending hours upon hours arguing with various levels of management or area groups or MB directly who directs you back to local area sounds like a great plan. They should just fix it to begin with. The service advisor should have already talked to management when they couldnt figure out there head from some place else.
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i have the same issue
