Audi S1 Error Codes Disrupting System Readiness

I faced similar issues with my 2019 Audi S3. The car diagnostics revealed multiple stored error codes related to the exhaust system sensors. The check engine light kept appearing intermittently, particularly after cold starts. A computer reset alone did not solve the problem. During the vehicle inspection, the mechanic found that the oxygen sensors were malfunctioning, causing incorrect readings in the engine management system. This affected the overall emissions performance and system readiness status. The repair required: Full diagnostic scan to identify all affected components, Replacement of faulty oxygen sensors, Clearing of stored error codes, Test drive to confirm system readiness After the repair, all error messages disappeared and the system readiness check completed successfully. This was a serious issue that needed immediate attention to prevent potential engine damage and ensure passing future emissions tests. For an S1 with similar mileage, I suggest having a complete car diagnostics performed rather than just clearing codes, as temporary fixes often mask underlying problems.

Thanks for sharing your experience with the S3 sensors. Similar problems showed up on my S1 last month, especially those pesky error messages on startup. The check engine light was also doing that unusual blinking thing. Did you remember how much the complete fix cost you? Also wondering if youve had any new issues pop up since the oxygen sensors were replaced? My onboard diagnostics is still showing some codes even after the vehicle inspection last week, so Im trying to figure out if I should expect more repairs.

Had the car checked again today and can confirm its all sorted now. The vehicle inspection showed no more error codes and the system readiness check passed without issues. Unlike the S3 case with faulty oxygen sensors, my issue was actually resolved through a software update and system reset during the drive cycle tests. Best part, there was no charge since it was covered under an existing service agreement. The diagnostic readout confirmed all systems are now communicating properly. Since the reset and update, the check engine light has stayed off and no error messages have appeared during startup. The exhaust system parameters are reading normal and all onboard diagnostics are showing green. My experience suggests getting a proper diagnostic scan is worth it, even if just to rule out more serious sensor issues that could affect future emissions tests. Been a week of normal driving now and everything remains stable, no error codes or warning lights have returned.

Thanks for the advice. Finally got this sorted out after visiting my mechanic last week. The whole situation turned out better than expected. After running complete car diagnostics, they found that my main oxygen sensor was actually failing, just like mentioned in the earlier replies. The onboard diagnostics kept throwing codes until they replaced it. The repair took about 3 hours total and cost 380 Euro including parts and labor. They also performed a drive cycle test to make sure all systems were reading correctly after the fix. The exhaust system is now working perfectly and all error messages have cleared. The best part is no more check engine light warnings when I start up in the morning. My mechanic explained that doing the computer reset and full system readiness check was crucial to ensure everything was properly calibrated after the sensor replacement. Really glad I got this fixed now rather than waiting until my next emissions test. The car runs much smoother and Im confident it will pass inspection with no issues.