I've had the differential pressure sensor changed today, the garage did a forced regen and low and behold driving home the EML comes back on and it drops back into limp mode... Any ideas for further things to consider would be appreciated!!
can a leaking manifold cause issues with the DPF filter? im having issues at the moment. recently had a new manifold on 5 weeks ago at weekend i got the DPF issues.Its probably be your intake manifold leaking geta pressure test done.......had similar problem
W204 c220 cdi........listen to some air leK on passenger sode while driving
We found that the issue i had post-forced regen was that the car had either not been 'reset' properly or needed a number (10?) of full-warm up drive cycles in order to clear the fault/EML/Limp mode. Low and behold on the way to the garage for them to re-investigate, it cleared itself out and did a long burn (i monitor the DPF temp with Torque app as the merc's dont tell you when they want or indeed are doing a DPF burn), and was fine for a couple more years. I then had the same issue re-emerge and bought an icarsoft, ran its DPF clean mode (i was skeptical) and that did the trick.
One key thing to do is to not run the car with the fuel low light on, this stops dpf regen and can cause clean cycles to be missed, thus clogging beyond the point where the car can/will auto regen. Also, using kickdown/full throttle will cancel a regen, so avoid this if you have any suspicion that a regen is in progress (again, some warning would be nice Mercedes, like a little light ala' VW...)
If you know what to look out for, you can tell when a Mercedes is doing a regen. The engine note changes, car feels less responsive, and it holds the gears for longer as if you were in sport mode.
Now, for lack of signs of a regen I have to give it to my BM at the moment. I’ve done over 3k miles in which time it would have done a few regens, but I kid you not there is no sign to say it is doing so.
No problem I recently (8 weeks ago) had a new inlet manifold fitted 800 nicka. I'm tempted to get rid haha.Hi Dean thanks for your reply i will the drive a go if that fails it looks like a garage job and hopefully its something as simple and as cheap as yours. Thanks for the advice