Audi S5 Oil Warning Lights Could Signal Bad Sensors

I had a similar issue on my 2014 Audi S4 last winter. The oil pressure warning appeared alongside multiple error messages on the dashboard. The car maintenance records showed all regular services were done, so the oil monitoring system definitely seemed suspicious. The root cause turned out to be a failed oil pressure sensor connection. The wiring harness had corroded where it connected to the oil sensor, causing intermittent false readings. While checking the oil detection system, the mechanic found the sensor itself was still functioning properly, it was purely a connection issue. The repair involved replacing the wiring harness and cleaning the connection points. Despite looking serious with all those warning lights, it was not a major mechanical problem. The oil gauge and pressure were actually fine, just reporting incorrectly due to the faulty connection. For your S5, I suggest having them specifically check the oil sensor wiring and connections first before replacing any components. The symptoms match exactly what happens when the oil monitoring system gets incorrect signals due to connection issues. This is much better than my initial fear of internal engine problems when those warnings first appeared. The car has run perfectly since the harness replacement.

Thanks for sharing your experience with the oil sensor issue. This matches what happened with my S5 last year with nearly identical symptoms. After those scary warning lights kept coming on, I also worried about major engine problems. My case was also just a faulty connection causing the oil detection system to malfunction. The sensor itself was working but not communicating properly due to corroded wiring. The engine oil and pressure were actually completely normal. Has the new harness solved everything long-term for you? Just curious if any other related engine oil warnings have popped up since the repair. Also, would you mind sharing what the fix cost in your case? I paid around 380 Euro for the complete repair including labor, but prices seem to vary quite a bit.

After getting the oil level sensor fixed, my S4 has been running perfectly with no warning lights for over 8 months now. The automotive oil system is working exactly as it should, with accurate readings and no false alarms. The repair was much cheaper in my case, just 95 Euro to fix the faulty sensor connection. The mechanic found it was simply a loose cable and corroded plug connection causing the oil detection system to malfunction. No need to replace the entire harness like they initially thought. Your 380 Euro repair sounds quite high in comparison, though costs can vary depending on what exactly needed replacing. The important thing is that in both our cases, it was just a sensor communication issue rather than any actual engine oil problems. The key takeaway for others facing similar warning lights is to have the oil monitoring system connections checked first before assuming worst-case scenarios. Often these alerts stem from faulty sensor signals rather than real mechanical issues.

I finally took my S5 to a new mechanic last week. The automotive oil warning lights had been driving me crazy, but I wanted to be sure about the diagnosis this time. The mechanic immediately checked the oil monitoring system connections, just as suggested. Found exactly what we suspected, corroded wiring was causing the oil detection system to send false signals. The actual oil pressure and engine condition were perfectly fine. Total repair came to 275 Euro, which included cleaning all sensor connections and replacing one section of the wiring harness. The oil gauge now shows accurate readings and all warning lights have stayed off. Much better than the 800 Euro quote my previous mechanic gave for unnecessary sensor replacements. Really glad I researched this before going in. Understanding it was likely just an oil signal issue rather than major engine problems helped me avoid getting oversold on repairs. The car runs perfectly now, and I finally found a trustworthy mechanic in the process.