VW Polo DPF Regen Failure & Dark Smoke Issues

Recently dealt with similar exhaust system issues on my 2004 VW Golf TDI. The symptoms matched exactly, warning light, black smoke, and failed DPF regeneration. Vehicle diagnostics confirmed a faulty exhaust back pressure sensor. The repair required removing the old sensor, cleaning the mounting points, and installing a new sensor with fresh gaskets. The exhaust sensor plays a crucial role in engine performance by monitoring pressure levels in the DPF system. When it fails, the engine control unit receives incorrect readings, leading to incomplete regeneration cycles. This turned out to be a serious issue requiring immediate attention, as continued driving risks damaging the DPF and catalytic converter. The repair resolved all symptoms, no more warning lights, normal exhaust color, and proper DPF regeneration. A thorough auto repair shop should pressure test the entire exhaust system while replacing the sensor to ensure no other leaks exist. This helps prevent similar issues from recurring. Regular maintenance and prompt attention to warning lights can help catch these problems early.

Just dealt with an identical problem on my Polo, it really hits home. Got it sorted with a new exhaust back pressure sensor and complete emission control system check. I had those exact symptoms with the black smoke and warning lights. The vehicle diagnostics were spot on and replacing the sensor fixed everything. Quick question, how much did the repair end up costing you? Also wondering if youve had any other issues pop up since the fix? My auto repair shop suggested regular system checks to prevent future problems with the exhaust system.

Had the work done about 3 months ago and everything runs perfectly since then. The pressure sensor replacement totaled 245€ including parts and labor. The vehicle emissions are back to normal and the engine performance has significantly improved. Regular system checks are definitely worth it. The exhaust back pressure monitoring is crucial for the DPF system to work properly. Getting it fixed promptly prevented any additional damage to other components in the exhaust system. The black smoke issue cleared up immediately after the repair. The mechanic explained that these sensors commonly fail on our VW models, but once replaced, they typically last for many years. Since the fix, no warning lights have appeared and the DPF regeneration cycles work as intended.

Thanks for the help with my Polo troubles. Finally got it fixed last week after taking it to a specialist mechanic. The vehicle diagnostics confirmed what you mentioned, it was indeed the exhaust back pressure sensor. Ended up paying 280€ for the complete job. The repair process went smoothly. They did a full exhaust system inspection while replacing the sensor. The mechanic noticed some minor carbon buildup but nothing serious affecting engine performance. Since the fix, the black smoke is gone and the warning light hasnt come back. DPF regeneration is working perfectly now. Really glad I checked here first. The repair cost was worth it to prevent bigger issues down the line. The exhaust sensor replacement has made a huge difference in how the car runs. Planning to stick to regular maintenance checks from now on to catch any issues early.