Please help advice needed

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mezza7

New Member
Joined
Aug 9, 2023
Messages
1
Location
chester
Car
mercedes c350 amg estate
Evening all,

Just after some advice I have a 62 plate merc c350 had an oil leak was diagnosed by local mech as rear main oil seal, transpires it wasn’t and was oil cooler , both parts replaced just had the car back this evening after nearly 6 weeks (don’t ask) and now the car won’t go above 3k revs in auto, on paddles or through box . Any help would be greatly appreciated had a quick look online says limp mode and try leaving ignition off and restarting . Still the same ….no fault codes on dash etc . Many thanks in advance
 
I had the same "won't go above 3K" with my S203 C270Cdi just after I bought it - and while it was still under warranty thankfully. It was the MAF, changing it sorted the problem!!
 
You will need the codes reading, could be a number of things causing it. Without codes you are playing parts darts.
 
Another thing I found with the problem on my S203 C270Cdi was that the kickdown did not work, so if you've got both faults (not rev above 3k and no kickdown) to me it points to the MAF. Apologies for the slow memory, the problem with the S203 was 15 years ago, 2 years before I PX'd it for the current S204 C220!
 
Could remove one of the battery terminals to reset the electric system and see if that works. possibly a fault code still stored
 
Evening all,

Just after some advice I have a 62 plate merc c350 had an oil leak was diagnosed by local mech as rear main oil seal, transpires it wasn’t and was oil cooler , both parts replaced just had the car back this evening after nearly 6 weeks (don’t ask) and now the car won’t go above 3k revs in auto, on paddles or through box . Any help would be greatly appreciated had a quick look online says limp mode and try leaving ignition off and restarting . Still the same ….no fault codes on dash etc . Many thanks in advance
To do the oil cooler seals they would have had to remove and replace everything in the "V" between the two banks of cylinders. Most likely cause is that they have not connected something back up properly or they have broken something on the turbo actuator mechanism. They are waiting for you to tell them there is a "new fault" for you to pay them to diagnose. It sounds like you need to find a specialist who knows what they are doing; oil cooler seals are so common on the om642 that they should not really be misdiagnosed.
 
If the fault didn't exist before seals were done and if it's the om642 I'd say your mechanic has not put something back properly and from experience it's probably an electrical plug, reading codes will point you in the right direction.
 
Please read this....


BTW.... don't be ashamed with your 6weeks. I gone past 3months :)

Honestly I hope it'll help.

Maybe if you could drive or try to drive and have somebody to record short video. I would tell you if mine did the same.
 

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