Q7 Diesel Power Loss + Black Smoke = DPF Warning Signs

Had the same symptoms on an Audi A6 3.0 TDI. The exhaust system was clogged due to a failed regeneration process. The engine light came on during highway driving, followed by significant power loss and black smoke. A proper vehicle inspection revealed the DPF was completely blocked. Cleaning was not an option due to internal damage. The DPF needed full replacement along with pressure sensors. This was a serious issue that required immediate attention to prevent further engine damage. The root cause was frequent short trips preventing proper regeneration cycles. The fix included: New DPF unit installation, Pressure sensor replacement, ECU reset, Fuel injector cleaning After repairs, fuel efficiency improved significantly and the engine regained full power. To prevent future issues: Drive 15-20 minutes regularly at steady speed, Allow complete regeneration cycles, Use high-quality diesel fuel, Follow maintenance intervals strictly These symptoms definitely indicate DPF problems requiring professional diagnosis. Delaying repairs risks more extensive engine damage.

The DPF replacement fixed my power issues completely. Had my diesel filter and sensors replaced too during the job since the exhaust system was already opened up. The engine light never came back and performance is like new again. Would you mind sharing what the repair cost in your case? Also curious if youve had any related problems since the work was done? My vehicle has been running strong for 15000km post-repair but want to learn from others experiences.

The complete DPF repair cost me 1550 Euro, which included replacing the defective diesel particulate filter and installing new sensors. The backpressure readings are now perfect and the exhaust system works flawlessly. No issues at all in the 45000km since the repair. The filter replacement solved all performance problems. My mechanic did a thorough DPF cleaning of the entire system during installation, which likely helped prevent any recurring problems. Some tips that helped maintain optimal performance after the fix: Regular highway drives for proper regeneration, Using premium diesel fuel, Not interrupting active regeneration cycles, Keeping up with maintenance intervals The investment was worth it considering the improved fuel economy and restored engine performance. The exhaust emissions are now clean with no smoke under acceleration.

Thanks for the feedback. After months of frustration, I finally took my Q7 to a specialized diesel workshop. The vehicle inspection confirmed what you experienced, a completely clogged DPF. The total repair came to 1850 Euro including parts and labor. The mechanic found that my diesel filter was also contaminated and replaced it while the exhaust system was apart. The job took two days but the results were worth the wait. My Q7 runs like new again with: Full power restored, No more black smoke, Better fuel efficiency, No warning lights Its been 15000km since the repair and everything is still perfect. Following the advice about longer drives and letting regeneration cycles complete has helped prevent any repeat issues. The extra cost of premium diesel seems worth it for protecting the new DPF. Lesson learned, dont wait too long when these symptoms appear. Proper diagnosis and repair by a qualified shop is crucial for these complex diesel systems.