RS3 Oil Sensor Malfunction Causing False Warning Alerts

The oil pressure sensor issue you describe matches what I encountered with my 2020 Audi S3. The automotive oil warning persisted despite proper oil levels, pointing to a sensor issue rather than an actual oil pressure problem. The root cause was a faulty connection between the oil detection system and the ECU. The oil gauge would out of nowhere trigger warnings due to corroded wiring near the sensor housing. This required replacing both the sensor unit and the associated wiring harness. The repair process involved: Testing the oil pressure sensor output signals, Inspecting wiring for deterioration, Replacing the complete sensor assembly, Clearing stored fault codes, Running diagnostic tests to confirm proper oil signal transmission This was a serious issue requiring immediate attention, as false oil pressure readings could mask actual oil pressure problems. The repair prevented potential engine damage that could occur from ignoring real oil pressure issues due to unreliable sensor data. The fix has been reliable with no recurring warning lights or error codes since the sensor replacement and rewiring.

Thanks for sharing your experience. Had the exact same issue with my RS3 last month. The engine oil monitoring system kept throwing false warnings despite everything checking out fine during inspection. The car maintenance history was spotless too, which made it extra frustrating. Your solution with the sensor replacement matches what I suspected. Before I take it in for repairs, could you recall roughly how much you paid for the fix? Also, has everything been running smoothly since the repair, or have you noticed any other sensor issues popping up? The wiring problem you mentioned is particularly interesting since my mechanic initially dismissed the possibility of a connection issue. Looking back, did you notice any warning signs before the oil pressure warnings started appearing frequently?

The repair worked out perfectly for my S3. After paying 95 Euro to fix the faulty cable connection at the oil level sensor, the oil monitoring system has been running flawlessly. A thorough inspection revealed the issue was simpler than initially suspected, just a bad connection at the sensor plug rather than a complete sensor failure. No other sensor issues have emerged in the past 6 months since the repair. The oil gauge readings are now consistently accurate and the warning lights have completely stopped. Looking back, there were subtle signs, occasional flickering of the oil pressure warning that would come and go, but these were easy to miss until the problem became more frequent. Your mechanic should definitely check the wiring and connector first. The sensor itself might be perfectly fine, making this a much simpler fix than a full sensor replacement. A proper diagnostic test will quickly reveal if its just a connection issue or if the oil level sensor itself needs replacement. The key is finding a shop that properly troubleshoots the oil sensor signal rather than jumping straight to replacing expensive parts. The stable readings since my repair confirm it was definitely worth getting this sorted properly.

Thanks everyone for the helpful replies. Finally got my RS3 fixed last week and wanted to share how it went. Took it to a different mechanic who actually listened to the symptoms and did proper diagnostics first. Turns out you were right, it was mainly a wiring issue near the oil pressure sensor. The connection had gotten corroded and was causing intermittent false readings in the oil monitoring system. The total repair came to 180 Euro, which included cleaning the connector, replacing some damaged wiring, and updating the sensor firmware. Much better than the 500 Euro quote I got from the previous shop who wanted to replace the entire sensor unit. Been driving for a week now with no warning lights or error codes. The oil pressure readings are steady and the car maintenance system is working normally again. Really glad I got a second opinion instead of rushing into expensive repairs. This whole experience taught me to be more selective with repair shops and to research sensor issues thoroughly before agreeing to major replacements.