Audi SQ5 Fuel Injection Issues After Mechanic Visit

I had similar symptoms with my 2016 Audi Q7 TDI. The rough running and fuel injection compensation errors often point to failing injectors. In my case, onboard diagnostics revealed uneven fuel distribution across cylinders. The issue required more than a simple system reset. The mechanic found carbon buildup in two injectors affecting fuel economy and causing misfires. The repair involved removing, cleaning, and testing all injectors, plus replacing the defective ones. This is considered a serious repair since faulty injectors can lead to: Poor fuel atomization, Engine misfires, Increased emissions, Potential engine damage if left untreated Performance tuning was needed after installation to ensure proper fuel delivery timing. The complete repair took two days, including calibration and testing. Based on your symptoms and mileage, it sounds very similar to what I experienced. Getting this fixed promptly is important. Continuing to drive with faulty injectors risks further engine damage and worse fuel economy. The repair should include a full diagnostic scan and performance verification after replacement.

Thanks for sharing your experience with injector issues. I ran into almost the same problems with my SQ5 last summer. The drift compensation values were way off and required recalibration of the airflow sensors along with injector cleaning. Did you remember roughly what the total repair cost came to? Also curious if youve had any recurring issues since the initial fix? My fuel economy is still not quite back to normal and Im wondering if this is common.

Since getting the injection valve replaced and having the reset quantity drift compensation adjusted, my Q7 has been running perfectly. The total repair came to 515 Euro, which included the new injector, labor, and all necessary performance tuning. The fuel economy returned to normal after about 2-3 tank refills once the onboard diagnostics fully adapted to the new injector settings. This adaptation period is quite normal as the system needs time to optimize the compensation adjustment parameters. I have not experienced any recurring issues in the past 15 months. The repair shop did a thorough job with the calibration and reset procedure which seems to have resolved all the initial problems completely. If your fuel economy hasn't improved yet, it might be worth having the compensation values checked again to ensure everything is properly calibrated.

Thanks everyone for the insights. I took my SQ5 to a different mechanic for a second opinion. The diagnosis confirmed faulty injectors but also revealed issues with the high-pressure fuel pump. The repair included replacing two injectors, cleaning the others, and installing a new fuel pump. The total bill came to 890 Euro including parts and labor. The mechanic performed a complete reset procedure and ran several tests to verify the fuel injection system was working correctly. After the onboard diagnostics completed its learning cycle, the engine runs smooth again. Fuel economy is now back to normal after about 4 full tanks. No more check engine lights or rough running issues. The drift compensation values are now within spec according to the last scan. Definitely worth getting it properly diagnosed and fixed rather than trying quick fixes.