VW Sharan DPF Clogged: Loss of Power & Black Smoke

Had the same symptoms on a 2008 VW Touran diesel. The reduced power and black smoke pointed to exhaust back pressure sensor issues, which connects to the DPF system. When the sensor fails, it cant properly measure DPF pressure, causing the engine to run in low power mode. The repair required replacing both the pressure sensor and cleaning the DPF system. The exhaust back pressure sensor is critical because it monitors diesel exhaust flow and signals when regeneration is needed. Without proper readings, the DPF gets clogged, leading to more serious engine problems if left unchecked. Main signs that confirmed the diagnosis: Warning light activation, Significant power loss during acceleration, Dark exhaust emissions, Strong diesel smell from exhaust, DPF regeneration cycles failing to complete This was a serious issue requiring immediate attention. Continuing to drive with these symptoms risks permanent DPF damage and potential engine problems. The repair involved specialized diagnostic equipment to reset the system after parts replacement. Would recommend getting it checked by a workshop with proper diesel engine diagnostic capabilities, as general mechanics often miss the connection between pressure sensors and DPF issues.

Thanks for sharing that detailed reply about the pressure sensor and DPF issues. I experienced almost identical problems with my Sharan last winter, including the reduced power and heavy diesel exhaust smell. Ended up being exactly what you described with the back pressure sensor. Curious how much the complete repair cost in your case? Mine was significant but wondering if prices vary. Also, has everything worked properly since the fix or have you noticed any other DPF regeneration problems?

Really glad to share an update. Since getting the exhaust back pressure sensor replaced, the DPF system has been working flawlessly on my Touran. The repair cost came to 245€ total, which covered both parts and labor. The emission control system now functions properly with no more warning lights or power issues. The fix completely resolved those concerning symptoms, no more black smoke, diesel smell, or reduced power during acceleration. The DPF regeneration cycles now complete normally without any problems. Regular driving habits seem to be enough to maintain proper particulate filter function. Its been about 8 months since the repair, and the exhaust system continues to perform exactly as it should. I was relieved it was just the faulty sensor and not a more expensive DPF replacement. Getting the sensor fixed early likely prevented more serious damage to the particulate filter components. If your repair cost was notably higher, they might have needed to do additional cleaning or maintenance on other exhaust system parts. But the sensor replacement alone typically falls in this price range.

After seeing all the helpful advice here, I wanted to share how my repair went. Took the Sharan to a specialized diesel workshop that actually knew what they were doing. Total bill came to 320€ which included both the pressure sensor replacement and a thorough DPF cleaning service. The mechanic confirmed the exhaust back pressure sensor had completely failed, causing the particulate filter system to malfunction. They showed me the old sensor which was covered in soot deposits. The cleaning process took about 4 hours but made a huge difference. Two weeks after the fix and the car runs like new. No more warning lights, power loss is completely gone, and the exhaust smell has disappeared. The low pressure problems cleared up immediately after the sensor replacement. Regular highway drives seem to keep the DPF regeneration working properly now. Definitely worth getting it sorted by specialists who understand these systems. The first mechanic I visited wanted to replace the entire DPF unit which would have cost over 1000€. Really glad I got a second opinion.