VW Eos TDI: DPF Regen Failure & Black Smoke Alert

Had the same exhaust system troubles on my 2012 VW Passat TDI. The vehicle diagnostics revealed a faulty exhaust back pressure sensor, which was causing similar symptoms, black smoke, DPF regeneration failures, and engine warning lights. The car maintenance procedure involved testing the complete exhaust system. The back pressure readings were way off normal parameters, confirming sensor malfunction. Auto repair required removing the old sensor, cleaning the mounting points, and installing a new unit with proper calibration. This turned out to be a serious issue since a failing pressure sensor can cause: Incorrect fuel injection timing, DPF system damage, Increased soot buildup, Reduced engine performance, Potential turbocharger stress The repair resolved all symptoms, no more warning lights, proper DPF regeneration cycles, and normal exhaust operation. Regular exhaust system inspections are now part of my maintenance routine to prevent similar issues. Given your symptoms match exactly what I experienced, strongly recommend having the back pressure sensor checked and replaced if faulty. Delaying could lead to more expensive repairs involving the DPF or turbocharger.

Dealt with similar troubles on my Eos last winter. That detailed explanation about the exhaust system problems matches my experience. The pressure sensor replacement fixed everything for me too, no more black smoke or warning lights since the auto repair. How much did your exhaust system repair end up costing? Also wondering if youve had any other vehicle emissions issues pop up since getting it fixed? My car maintenance costs were hefty but worth avoiding bigger problems down the line.

Just had my invoice from last week actually. The pressure sensor replacement came to 245€ total, including parts and labor. The vehicle diagnostics confirmed it was definitely the faulty sensor causing all those exhaust system problems. Since the repair, engine performance has been spot-on with zero emission-related troubles. The back pressure readings are now within normal range, and the DPF regeneration cycles are working perfectly. No warning lights or smoke issues in the past 7 days, which is a good sign. Regular checks on the exhaust system components will help catch any future problems early. The investment in fixing the pressure sensor now definitely beats risking damage to more expensive parts like the DPF or turbocharger.

Thanks for sharing that cost info. Just got back from getting mine fixed yesterday actually. The mechanic did a thorough vehicle diagnostics check and found the same exhaust back pressure issues you mentioned. Total bill came to 280€ for the sensor replacement and labor. The car maintenance visit was pretty straightforward. They confirmed the faulty sensor was causing my vehicle emissions problems and got everything sorted in about 3 hours. Already noticing better engine performance, no more black smoke or warning lights, and the DPF seems to be regenerating normally now. Really glad I got it handled before it could cause bigger problems. Was worried about potential DPF or turbo damage from running with bad back pressure readings. The mechanic said catching it early probably saved me from more expensive repairs down the road.