Need help car entering limp mode

[MarcusHardcastle]

Hi all I could really do with some help

I drive a Mercedes c220 amg 2.2 diesel automatic 2012

Recently while heading onto the motorway I noticed my car wouldn't enter 7th gear and was staying high revs I headed off the motorway and noticed the car wasn't in the correct gears for the speeds I was always running around 1 revs when the car was okay now it was sticking around 2. And I had a yellow engine light

I also noticed when this was happening the turbo would not work or the manual gear changing.

I took it to a garage and the man said the alarm was a dpf regeneration failure.

So he said he did a force regeneration and lowered the percentage to 12% the car ran okay for 1 day after this and then the same problem happened again.

I took it back to him and he said the DPF sensor had malfunctioned and would need a new sensor installing, he charged me 180 pound and said the problem should now be fixed.

It was started doing it again 1 day after this.

I don't want to take it back to him cos he's charging me stupid amounts and not fixing the problem.

Does anyone have any ideas

Thank you

 

[Larkone]

Get it to a MB indy who has STAR and can properly diagnose this, throwing parts at is an expensive waste of time. Someone on here should be able to recommend a good indy around Leeds

 

[Tomhorton16]

I had this on mine, it seems to be a Mercedes thing, had my sensors replaced and values reset and hasn't happened since (touch wood)

 

[Tonygw]

Do you do lots of short journey's? Diesels with DPFs don't like it and it clogs the dpf.

But as mentioned its a common failure on many cars is the dpf pressure sensor. If may need recalibrating but also the pipes it attaches to should be clear, if they are blocked it can give the same result.

Let us know how you get on. As said, you need a proper merc specialist with STAR diagnostics.