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My dpf is clogged, the car is in limp mode and there is a huge rattle from the unit when the accelerator is pressed. Diagnosed as oil in the dpf and the cat converter is knackered. I am going to swap the part myself, very capable of car repairs and cant afford garage prices. The question is, Is the dpf simply take the old one out and put the new one on, the ecu would then read as no blockage and clear the fault, in theory?? right or wrong?? also is there anything important to note when dismantling/assembly. Cheers

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1 Answer

'58 5 series Msport diesel. Why did power suddenly drop off sharply and now won't accelerate past 40 mph?


your car is gone in limp/home mode.
that's a safety feature that manufacturer put in their car from preventing much damage to the engine.

need to it plugged int diagnostic machine

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Where is the throttle body located?


old post , and great question

the TB is a thing that contains the AIR throttle, the body holds

that TV throttle valve (or some call it a TP throttle plate)

this car has 6 engines, and varies by country. what country>?

what engine? (USA cars have a hood EPA tag, it states the engine)



sure cleaning it can help and for sure with throttle by wire.

the body gets full of EGR/PCV crap. (called GUNK) and if not

removed on high mileage cars, it jams the silly throttle by wire

motor. (and related\'s)

why not scan the PCM and SEE ALL DTC errors.

that be first. !!!



loose power has many causes, up to 50.

why not scan it first, (the CEL lamp to me is useless , unless stuck on)

scan it first.

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and will run slow. in limp mode.

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the TBW , throttle by wire has it\'s own limp mode.

the transmission too, and others.



The TBW has up to 4 TPS sensors. 2 on the foot and 2 in the TB

if ANY of the 4 , do not AGREE, you go to LIMP HOME MODE>

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is engine power loss.

cause by (top ones of 50)

1: never getting a tuneup. and for sure the 60k mile.

2: misfire, caused by 3 major things. ask.

3: flooding.

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5: clogged air filters see #1

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