Audi A4 B8 DPF frequent regens and problems

[Mircea Lungu]

Hi. I have a 2010 Audi A4 B8 170hp ( CAHA ) and my DPF is acting up. I have to mention since I got the car, I have changed the EGR and one injector. When I first got the car, driving home I noticed the spiral flashing sign on the dashboard. I didn’t pay much attention to it, I used to just stop the car and it would disappear. Now a few months later I finally tracked it down to being part of DPF regens. Due to driving habits and driving a lot in the city my DPF basically got clogged up to almost 50g, and although the car went into LIMP mode I managed to unclog it to 1g (entry) and 4g(out) with someone’s help using a VCDS. There was also an error on one of the sensors which detects the temperature of exhaust gases so I replaced it. I now drive the car more revved up(~2500rpm) and change gears at 3000rpm minimum but even so it still seems to get clogged up. Today I took it for a drive through the city and traffic was not bad at all, what I noticed was for about an hour the car didn’t have any problems and the start/stop system was being deployed at red lights, but after a few more minutes while going uphill the water temperature suddenly jumped to 90 ( keep in mind that the water temperature almost always stays below 90 during driving even at 8 degrees C today) and the flashing spiral sign appeared on the dashboard again. So I took it on a long road trying to keep it in 4th and 5th gear but it would not disappear(and again the water temperature would sit BELOW 90 most of the time unless i was going uphill in like 5th gear) and eventually I stopped the car because I couldn’t keep driving forever, basically interrupting the “regen”. So my question is, what can I try to get my DPF in check? I have replaced the faulty sensor, I drive the car pretty sporty and rev it up a lot of the time, I don’t drive below 2000rpm, and I haven’t driven in bad traffic. Is it a possibility that one of my thermostats is not working properly too? I really don’t want to do a DPF delete but I really can’t figure this out. I also have to mention that I’ve driven the car maybe 4 times since I replaced the faulty sensor and I think 3 out of 4 times my car started a DPF regen. (even when I only traveled large distances at constant speed). Any help is appreciated, thanks.

Topic