Audi A6 Diesel Power Loss Points to DPF Issues

Had similar symptoms with my 2003 Audi A4 2.0 TDI. The vehicle inspection revealed a severe DPF clog causing increased backpressure in the exhaust system. A sensor fault initially masked the real problem, making the engine management system reduce power output as a protective measure. The dark smoke during acceleration is a clear sign of DPF issues. In my case, the filter was beyond cleaning and required complete replacement. This was a serious repair job since the DPF is integrated with other exhaust components. The symptoms match exactly: reduced power, black smoke, and high mileage are typical indicators. Professional DPF cleaning might work if caught early, but given your mileage, a thorough diagnosis is essential. The exhaust backpressure needs proper measurement to determine if cleaning would be sufficient. A blocked DPF will continue causing problems and could lead to more severe engine damage if not addressed. Would strongly recommend getting it checked at a workshop specializing in diesel systems rather than attempting temporary fixes.

Thanks for sharing your experience. My A6 had the exact same symptoms last year. The diesel filter replacement fixed the power issues and smoke completely. The regeneration process wasnt working properly anymore due to a sensor fault, which is why the DPF got completely clogged. Just curious, how much did the repair end up costing you and have you had any other DPF-related problems since the fix? Might need to deal with this again soon on my other car.

Thanks for asking about the repair costs. After taking it to my trusted diesel specialist, the complete filter replacement including parts and labor came to 1550 Euro. The exhaust system works perfectly now after fixing the defective diesel particulate filter. The engine light that kept coming on has stayed off, and the regeneration cycles are running normally again. The mechanic explained that the sensor fault was preventing proper regeneration, exactly like in your case. Since the repair 8 months ago, no DPF-related issues at all, no more dark smoke, full power restored, and fuel consumption is back to normal. Regular highway drives help keep the regeneration process working properly. If your other car starts showing similar symptoms, getting it checked early could save money, as a clogged filter can damage other engine components if left too long.

I went with the car to my regular workshop last week since Id been putting it off for too long. The mechanic confirmed the DPF was completely clogged, causing excessive exhaust backpressure. The regeneration system had basically given up due to that faulty sensor we discussed. The full diesel filter replacement including labor ran me 1350 Euro. Bit painful for the wallet but the car runs like new now. No more black smoke, power is fully restored and the exhaust system works perfectly. The mechanic showed me the old filter, it was totally shot. They also found and fixed a small exhaust leak while they were at it. Glad I went when I did since the clogged DPF was starting to affect other engine components. Planning to do more highway driving now to help maintain proper regeneration cycles. Appreciate the advice everyone shared here. Saved me from trying cheaper fixes that probably wouldnt have solved the underlying problem.