I have been told by Audi that my A6 fitted with the dpf filter is "unsuitable for short journeys"! I have problems with it whilst within the Warranty period but they first appeared towards the warranty cover - now I have had to have the car in the garage 7 times and the filter has been replaced twice as it has failed to clear when carrying out the instructions they give to clear it. It is not easy to carry out the instructions whilst driving in the centre of London or any other town or city for that Surely Audi should have made it clear when buying the car that this problem could occur - if they told people that the car was unsuitable for short journeys then presumably no one would buy them?

SOURCE: Hi, my freelander is a 1998 S reg 2.0TDI.

Best to have a good dealer tech test this...they have more exposure to it and know what to look for... It is inside the transfer case and not easily serviceable unless you have experience with trans type gearsets. Don't forget though that I am not there and can't do more than make an educated guess...I'm wrong here much more often than I am when making hands on diagnosis only because I cant hear, see and drive your vehicle. That is why I always stress that you need to have hands on diagnosis by someone that is well versed in your problem. In your case, I really hope that it turns out to be something simple and less expensive!!!
Good luck!

Ned C Cook

• 3433 Answers
• Posted on Oct 04, 2009

SOURCE: Audi A6 Starting problem

Try starting without touching gas pedal

SOURCE: p0471 and p2002 codes, Audi A6 2.0 DPF S-Line Auto

The DPF is designed to be self-cleaning to a certain extent if the engine is run for a good length of time the deposits should burn off. I would kick up a fuss with Audi about the warranty, ask them to show its exclusion. Unless the DPF has become physically damaged by something you have done then they need to have it fixed as it is a result of the deficiency in their design. This is not like some damaged tyre, open to abuse by the driver, the DPF is integral to the vehicle operation and through no commission on your part it is not functioning as it should.

Testimonial: "will get onto them, thanks for the assistance. "

SOURCE: p0471 and p2002 codes, Audi A6 2.0 DPF S-Line Auto

A6 2.0 TDI 1997
Got same problem around 35000Km. Engine light on with same error P0471. I was in France, Audi reset error and found nothing suspect. 4 weeks later same problem. (I felt engine was executing filter regeneration cycle very often). After 1 more week, Exhaust symbol came into large display and engine into safe mode (max 90Km/h). Contacted my Audi dealer in Belgium. They immediately told me pressure sensor (measures obstruction over DPF) was defective ; happens more often. Car was just beyond 2 Y old. Replaced under warranty. No more problems.