SQ8 Diesel Rough Running Due to Compensation Drift Error

Had similar problems with my Q7 3.0 TDI from 2017. The drift compensation error points to injector issues, which matches the rough running symptoms you describe. The airflow sensors initially looked suspicious, but after proper diagnostics, the problem was traced to faulty injectors affecting performance tuning parameters. The drift compensation values were way off spec, indicating the injectors werent delivering the correct fuel quantity. The fix required complete injector replacement and a full system reset to establish proper baseline fuel economy readings. Not a quick fix, the repair took two full days due to the complexity of modern injection systems. This is definitely a serious issue that needs professional attention, as incorrect fuel delivery can lead to engine damage if left unchecked. The critical part is having proper diagnostic equipment to accurately measure injection quantities and reset the compensation values after repair. Regular garages often lack these specialized tools needed for proper performance tuning of modern diesel injection systems. Would strongly recommend getting this addressed soon, as running with faulty injectors can cause additional engine damage and worse fuel economy over time.

Thanks for sharing those details about the injector fix. I had similar errors with my 2020 SQ8 and the rough running issues really had me worried. The onboard diagnostics pointed to similar injector compensation problems but I also had a faulty sensor wiring that needed attention. Did you keep track of the repair costs from your Q7 fix? Also wondering if youve had any other issues pop up since getting the injectors replaced and system reset done?

After getting the injection valve replaced and the system reset completed on my Q7, everything has been running perfectly smooth. The total repair came to 515 Euro for fixing the defective injector, including the reset quantity drift compensation adjustment. The fuel injection system is now working exactly as it should. The onboard diagnostics show no more errors and fuel economy has notably improved since the repair. The rough running issues completely disappeared after the system reset and injector replacement. Its been about 8 months now with zero problems, no check engine lights or performance issues. The key was getting the proper diagnostic equipment to accurately reset the fuel compensation values after installing the new injector. A full system reset was essential to establish the correct baseline measurements for optimal fuel delivery. This kind of repair really needs specialized tools and expertise with modern diesel injection systems to get it right. The investment in proper repair was worth it to prevent potential long-term engine damage from incorrect fuel delivery.

I finally got the issue fixed after dealing with ongoing problems for weeks. Found a specialized diesel shop that really knew their stuff about modern fuel injection systems. The total repair ended up costing 780 Euro, which covered both the faulty injector replacement and sensor wiring fix. The mechanic showed me the diagnostic readings before and after, the drift compensation values were seriously off spec, causing the rough running. They used specialized diagnostic equipment to properly reset the system and establish new baseline measurements for the fuel delivery. The car runs perfectly smooth now, with much better fuel economy than before. No more check engine lights or performance issues. Really glad I got it handled by someone who understood these complex injection systems. The proper reset procedure made all the difference compared to my previous unsuccessful repair attempts. All the car sensors are now reporting normal values and the engine performance feels like new again. Definitely worth finding the right specialist shop for this kind of technical repair.