Q7 Injection System Glitch After Service Visit Sparks Issues

Had similar symptoms on a 2020 Audi Q8 50 TDI. The reset quantity drift compensation issue often points to injector problems. In my case, a system reset temporarily resolved the rough running, but the check engine light returned after 200km. The root cause was a faulty fuel injector causing irregular fuel delivery patterns. Car sensors detected inconsistent injection timing, triggering the compensation adjustment warnings. The unstable engine performance you describe matches exactly what happened, especially noticeable during cold starts and idle. The complete fix required injector replacement and a full reset procedure of the fuel injection system. This is not a minor issue, as faulty injectors can impact fuel economy and potentially cause long-term engine damage if left unaddressed. A proper diagnostic check should verify if the drift compensation values are within spec. If values exceed normal range after multiple reset attempts, injector replacement is likely needed. Temporary fixes through system resets usually dont solve the underlying problem when dealing with injector-related issues. Worth noting that this repair requires specialized equipment to properly calibrate new injectors to the engine management system.

Thanks for sharing your experience. Dealing with something similar on my Q7 now. The fuel economy dropped significantly after these symptoms started showing up. My airflow sensors also needed recalibration when the mechanic diagnosed it. Did you remember the total cost for fixing the injector issue? Just trying to get a rough estimate before taking it in. Also curious if any other problems popped up since the repair, sometimes these injection system issues can indicate other underlying problems.

After getting it fixed by a proper diesel specialist, I can confirm the reset quantity drift compensation issue was fully resolved. The total repair came to 515 Euro for replacing the defective injection valve. The performance tuning after the repair made a noticeable difference, the engine runs smooth again and fuel economy returned to normal levels. The onboard diagnostics now show all values within spec, and the airflow sensors are working correctly with the new injector settings. No other problems have emerged in the months since the repair. The key was having a shop with the right diagnostic equipment to properly calibrate the new injector. While the initial cost might seem high, preventing potential engine damage made it worthwhile. The drift compensation values have remained stable, suggesting the faulty injector was indeed the root cause. Regular system monitoring through the onboard diagnostics shows everything functioning as intended now.

Thanks everyone for the helpful responses. Just wanted to update on my situation. Took it to a diesel specialist who properly diagnosed the injection system using their advanced diagnostic tools. The faulty injector was causing the compensation adjustment issues. Total repair cost came to 780 Euro including parts and labor. The mechanic also performed a thorough system reset and recalibrated all parameters after the replacement. The engine now runs perfectly smooth with no check engine lights. Fuel economy is back to normal and the onboard diagnostics show all systems running within spec. The performance tuning they did after the repair made a huge difference. Definitely worth finding a specialist who really understands these modern diesel injection systems rather than trying quick fixes. Glad I addressed it quickly before it could cause any long-term engine damage. Still monitoring things but so far no other issues have appeared. The drift compensation values are stable and all systems are working as they should.