Audi Q2 Power Loss and Check Engine Mystery Needs Help

As a Q3 2.0 TFSI owner, I faced nearly identical symptoms last year. The check engine light appeared after similar power loss issues. The diagnostic code pointed to ECU mapping irregularities caused by previous third-party chip tuning. The fault code indicated engine performance parameters outside factory specifications. An auto scanner revealed multiple sensor readings that were inconsistent with standard values. The root cause was incompatible software modifications affecting fuel injection timing and boost pressure control. The fix required: Complete ECU reset to factory settings, Removal of unauthorized tuning software, Recalibration of engine management system, New oxygen sensor installation, Software update with genuine manufacturer programming This was a serious issue that could have led to engine damage if left unaddressed. The power loss occurs because the engine enters a safety mode to prevent damage when it detects irregular parameters. Would recommend getting a second diagnostic scan from an authorized dealer. They have specialized vehicle diagnostics equipment to properly identify ECU-related issues. The repair requires specific software tools and expertise with engine management systems. The symptoms match classic signs of problematic aftermarket tuning. Generic mechanics often struggle to properly diagnose these electronic issues without manufacturer-specific diagnostic equipment.

Thanks for sharing that detailed experience. Had the exact same power loss and check engine light issue with my Audi Q2 a few months back. The fault code reading also pointed to ECU problems which was quite concerning. Since you went through a similar engine issue, do you remember roughly how much the complete fix cost you? Also curious if any other problems emerged since getting it repaired?

Had the ECU mapping issue fully resolved at an authorized shop for 180 Euro. The fault code disappeared immediately after they removed the problematic third-party tuning software and restored factory settings. The diagnostic scan confirmed everything was back to normal specifications. Its been running perfectly since the repair with no check engine lights or power loss issues. The scan tool readings now show all engine parameters are within proper ranges. The unauthorized chip tuning was definitely the root cause, as no other dashboard lights or error codes have appeared in the months following the fix. Would recommend avoiding aftermarket tuning in the future, as it often leads to these kinds of electronic control unit problems. The cost of proper repair is usually much less than dealing with potential engine damage from incompatible software modifications.

A follow up on my case, took it to an authorized dealer after getting your advice. They ran a complete vehicle diagnostics check and found the same ECU mapping problems you mentioned. The engine issue turned out to be from a previous owner's tuning attempt. The total repair came to 210 Euro, which covered: Full system diagnostic scan, ECU reset and reprogramming, Engine parameter recalibration After 3 months of driving, no more fault codes or check engine lights have appeared. The power loss problem is completely gone and the engine runs smoothly again. Really glad I got that second opinion instead of replacing parts unnecessarily at the first shop. Lesson learned about checking vehicle history more carefully for aftermarket modifications. The proper fix was much simpler and cheaper than what the initial mechanic suggested.