Audi TT Oil Pressure Warning: Sensor Issues Explained

I had a similar issue with my 2002 Audi A4 1.8T. I have some experience working on cars, mainly doing basic maintenance and troubleshooting. The symptoms you describe match what I encountered, oil pressure warning light and cluster warnings. The engine temp sensor was sending incorrect signals due to a faulty wire connection. After running car diagnostics, my mechanic found the temp sensor was getting inconsistent readings because of a damaged plug connection. The fix involved replacing the wiring harness connector to the oil temperature sensor. Total cost was 95 Euro including labor. Since then, no more warning lights or false readings. Before suggesting specific fixes, it would help to know: Have you noticed any actual oil pressure or temperature issues? Does the warning appear more when the engine is cold or warm? Have you had the exact error code read from the system? Is the car maintaining normal operating temperature? These details would help determine if your car sensor issue matches what I experienced or if its potentially something else in the system. Regardless, I recommend getting proper car diagnostics done soon, as oil pressure warnings shouldnt be ignored even if theyre false readings from a bad sensor.

Last service was at 31421 km. Thanks for the detailed response. The warning seems to occur more frequently when the engine is warm, typically after 15-20 minutes of driving. I got error code P0196 from the scanner, which points to the oil temp sensor circuit. Haven't noticed any actual oil pressure problems, and engine temperature stays normal according to the gauge. Just want to make sure its really the sensor before replacing parts. The 95 Euro repair cost you mentioned sounds reasonable if thats all it needs. Will have a professional check the wiring harness connection first since that was the culprit in your case.

Thanks for the follow-up details. Your symptoms match my experience exactly, especially the timing of the warnings appearing after warm-up. The P0196 code and normal operating temps strengthen my confidence that we dealt with the same temp sensor issue. After fixing the wiring on my A4, I learned these oil temp sensor problems are fairly common in the 1.8T engines. The good news is the repair has lasted over 3 years now with no recurring issues. One extra tip from my experience: when they check the wiring harness, have them inspect the oil pressure switch too, since its right next to the temp sensor. Mine had some corrosion that could have caused problems later. The car diagnostics might not catch this early, but its worth checking while theyre in there. The car sensor setup on these engines is pretty reliable overall, when you get false readings like this, its usually just the wiring connection rather than a total sensor failure. Given your description and error code match my case so closely, I expect youll be back to normal after addressing the wiring. Let us know how the repair goes. These engine sensor issues can be tricky to diagnose without the right experience.

Thanks for the input. Just got back from the shop and wanted to close out this thread with what we found. The mechanic confirmed the faulty oil temperature sensor diagnosis. They found corrosion on both the sensor wiring harness and the oil pressure switch, just as suggested. Total repair cost came to 120 Euro including parts and labor, slightly more than expected but worth it to fix both components. The car sensor readings are now stable, oil gauge shows normal pressure, and no more warning lights in the cluster. Engine temperature stays consistent too. Definitely glad I checked the forum before going in blind, helped me understand what to expect and avoid unnecessary repairs. For anyone searching with similar symptoms: pay attention to when your warnings appear, get that error code read, and have them check both the temp sensor wiring and pressure switch if youre seeing P0196. Going to mark this as solved since the fix matched the advice given. Appreciate all the detailed responses that helped diagnose this automotive sensor issue correctly.