Audi A1 DPF Regen Failure & Sensor Issues Fix Guide

I had a very similar issue with my 2016 Audi A3 diesel last winter. Having some experience with exhaust system repairs, I initially tried checking the connections and cleaning around the sensor area, but the problem persisted. The symptoms matched yours exactly, constant emission control warning light, visible smoke, and failed DPF regeneration attempts. The exhaust back pressure sensor was indeed the culprit, causing incorrect readings which prevented proper regeneration cycles. The workshop confirmed the diagnosis using specialized diagnostic equipment. They replaced the pressure sensor and performed a forced DPF regeneration to ensure everything was working correctly. Total cost was 245 Euro, including parts and labor. The fix completely resolved all symptoms. Before suggesting specific solutions, could you provide: Current mileage on your A1, How long the warning light has been on, Whether you do mostly city or highway driving, Any previous DPF-related repairs This information would help determine if there might be additional vehicle emissions components requiring attention besides the sensor itself. The good news is that pressure sensor issues are relatively straightforward to fix once properly diagnosed, and addressing it promptly helps prevent more extensive exhaust system damage.

Thanks for the helpful details on the sensor replacement. Just had my regular service done at 76873KM, so maintenance is up to date. The warning light first appeared about 2 weeks ago. Vehicle diagnostics confirmed my exhaust sensor readings are way off normal parameters, matching what you experienced. Interesting that your engine performance returned to normal after the fix, thats encouraging since Im seeing similar symptoms. The 245 Euro repair cost seems reasonable compared to what I was quoted. Did you notice any improvement in fuel consumption after the pressure sensor replacement? Also, did they recommend any specific driving patterns to help maintain the DPF system going forward?

Thanks for those additional details. Yes, I actually noticed a significant improvement in fuel consumption after the pressure sensor replacement, about 0.8L/100km better on average. My A3 runs much smoother now, especially during acceleration when the engine performance was previously compromised by the faulty sensor readings. The workshop advised driving at sustained higher speeds (above 2000 RPM) for at least 15 minutes regularly to help maintain proper DPF function. This ensures the exhaust system operates at optimal temperatures for regeneration. Since the repair, I havent had any vehicle emissions issues or warning lights. One thing I should mention, they found my DPF was about 65% clogged due to the failed regeneration attempts. The new pressure sensor allowed proper regeneration to complete, but they recommended monitoring the exhaust back pressure readings for the next few months just to ensure everything stabilized. The repair has been solid for over 8 months now. Just make sure they use OEM parts for the sensor replacement, aftermarket sensors can sometimes cause compatibility issues with the engine management system.

Thanks for sharing that follow-up experience. My symptoms seem identical, and knowing your repair has lasted 8 months without issues is reassuring. The fuel consumption improvement you mentioned is particularly interesting since Ive noticed mine has gotten worse lately. My driving patterns are mostly highway commuting, so maintaining those higher RPMs for DPF maintenance should be manageable. Given the vehicle diagnostics confirm similar sensor issues, and the engine performance problems match your experience, Im going to proceed with the pressure sensor replacement. Ill make sure to request OEM parts and have them check the DPF clogging levels while theyre at it. The exhaust system symptoms you described match mine exactly, so Im feeling more confident about this being the right fix. Will schedule the repair for next week to prevent any additional damage to the emission control components. Great to hear the workshop provided detailed maintenance advice, Ill be sure to ask mine for similar guidance on optimal driving patterns for DPF health.