A2 TDI DPF Failure: Heavy Smoke and Poor Performance

Had similar issues with my 2008 A3 2.0 TDI. The exhaust sensor readings were off, triggering multiple dashboard warnings and preventing proper DPF regeneration. Vehicle diagnostics confirmed a faulty back pressure sensor, which was causing incorrect readings to the engine control unit. The repair involved: Complete diagnostic scan, Removing and cleaning the DPF area, Replacing the exhaust back pressure sensor, Resetting the engine management system, Testing emission control systems This is a serious issue requiring proper attention. Continued driving with these symptoms risks permanent DPF damage and increased engine wear. The faulty sensor prevents proper emission control and affects overall engine performance. The repair process took about 4-5 hours at the workshop. After fixing, the engine ran smoother, smoke disappeared, and fuel efficiency improved noticeably. For peace of mind, get a proper diagnosis from a workshop specializing in diesel engines and emission systems. Would strongly advise against postponing repairs, as DPF systems are sensitive to prolonged malfunction.

Thanks for sharing that experience. I had almost identical symptoms with my A2 last winter. The auto repair shop found the same issue with the pressure sensor affecting the DPF. Curious, do you remember roughly what the total repair cost was? Also, has everything been running smoothly since the fix? My car feels much better after the repair but I keep checking the exhaust just to be sure there are no new issues popping up.

After getting it fixed at the workshop, everything has been running perfectly fine. The total repair cost was 245 Euro for replacing the defective exhaust back pressure sensor. It was worth every cent since the engine performance returned to normal and vehicle emissions are back to standard levels. The emission control systems are working as intended now, no more dashboard warnings or smoke issues. The DPF regeneration cycles happen normally, and the engine runs smoothly during acceleration. Its been several months since the repair, and Ive had zero issues with the back pressure readings or engine performance. Your instinct to keep an eye on the exhaust is smart, but with a properly functioning pressure sensor, you should be good. Regular maintenance checks will help catch any potential issues early.

After dealing with this mess, I finally took it to a different auto repair shop than my usual one. The vehicle diagnostics confirmed the back pressure sensor failure. Total bill came to 280 Euro including parts and labor. The mechanic walked me through the emission control system issues and showed me the faulty parts. Really appreciated their transparency after my previous bad experiences. The exhaust sensor replacement fixed everything, no more smoke, better acceleration, and the DPF regenerates properly now. Been about 3 months since the repair. Engine runs like new and vehicle emissions are normal. Still checking occasionally but havent seen any issues. Definitely learned my lesson about not delaying repairs when the DPF acts up. Glad I found a reliable mechanic who actually knows their stuff with diesel systems.