Yes Simon you were right all along. I caused the confusion by quoting from Chrysler spares manual which shows the DPF in the wrong place. But as you say, the DPF has a pipe before and after to measure the differential pressure and to automatically start regen process or warn if its getting blocked.
If the Diff pressure sensors are working properly, error codes should be flagged up before a blocked DPF starts effecting performance though.
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First I would check for any further error codes, particularly different ones, and clear existing codes.
It is also possible that the pressure sensor itself is faulty and needs changing but I dont think that would cause the driving symptoms you've got, but you never know.
If you have a multimeter you could check the pressure sensors resistance and output voltage rather than just fit a replacement.
Also possible EGR solenoid fault which is easily bypassed with a 4.7K resistor and takes just a few minutes to fit. When my EGR failed it definitley caused twitching at about 1500RPM but also eventually brought up a different error code to yours. Initially I had the twitching and like a "chirp" noise but no fault codes at all.
Alternativley you could clean the Mass Air Flow detector (MAF), but you need to clean it with the correct solution.
Aletrnative is a blockage in other parts of the exhaust system.
The above are only my opinions I am no expert, you may get better advice from much wiser and more experienced people than me. I am sure you will get many differing opinions though.
Good luck and keep us informed.
Cheapest and quickest starting point would be to fit a 4.7K resistor in place of EGR valve and see what happens to driving/twitching.
JUST SEARCHED OTHER POSTS AND "james1978" POSTED SIMILAR PROBLEMS AND IT WAS ACTUALLY A FAULTY EXHAUST PRESSURE SENSOR, SO IT APPEARS THAT A FAULTY SENSOR CAN CAUSE THE SYPTOMS YOU DESCRIBE. DONT KNOW HOW TO POST THE LINK BUT IF YOU SEARCH FOR "james1978" POSTS OR P0471 YOU WILL GET TO IT.
Jack
Last edited by jackwalton; 09-03-2012 at 08:35 AM.
Reason: Added Cheapest and quickest bit.
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I think the relevent pressure sensor is underneath the plastic engine cover and screws into the top of the EGR valve body at the rear LH side of the engine (LH when your sat in the drivers seat), near the engine bulhead (or "firewall" as the yanks say).
I would be tempted to remove the sensor and make sure the hole to the pressure sensor is not blocked up with crud. If it is you could carefully poke or drill it out.
Jack
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removed DPF for inspection, but everything is fine - nothing unusual, DPF isn't foul.
I have a theory that wicam's dpf got clogged up because he drove his car in limp mode for a while IIRC. I believe the normal regeneration cycle is suspended when the car is in limp mode.
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