Restricted Revs

[John Wilcock]

Hello everyone. Was wondering if anyone could help me please. I have a 2005 Mercedes C Class 220 CDI. Over the last month or so it seems to be restricting itself. when I go to accelerate away or overtake its like driving a tractor, no power, changes through the gears at about 2500 revs. Its ok when I first start but the problem happens about 15 mins into a journey, for instance, i slow down to go round a roundabout then accelerate away...... nothing, just plods along. Any help or suggestions would be greatly accepted. Thanks. John

 

[Mark A]

Sounds like its going into limp home mode. You need to get the codes read on STAR, it could be any number of faults unfortunately.

Welcome to the forum !

Mark

 

[John Wilcock]

Have taken it to a local garage who puts it on diagnostic but shows no faults. speed sensor?

 

[John Wilcock]

Thanks for your quick reply

 

[Mark A]

You are welcome.

If it wasn't A Mercedes diagnostic machine, then it may not pick up the codes.

It could be anything from air flow sensor to cam sensor to gearbox trouble unfortunately.