Audi S5 Temperature Sensor Failure Affects Multiple Systems

Having some experience with sensor diagnostics, I faced a very similar issue with my 2021 Audi S4 last winter. The temperature monitoring system showed multiple faults and the temperature-dependent functions acted erratically, just like your case. After a thorough sensor malfunction check, my mechanic found that the main temperature sensor wiring harness had a damaged connection. The symptoms matched yours exactly, climate control issues, mirror heating problems, and frozen washer nozzles. The temperature sensor replacement itself wasnt needed, but the cable connection required repair. The fix cost 95 Euro and took about 2 hours. Since then, all temperature-dependent systems have worked perfectly. However, to provide more specific guidance for your case, could you share: Have you noticed any error codes specifically? When did these issues first appear? Does the temperature display show realistic values? Have you had any recent work done near the front bumper where the sensor is located? These details would help determine if your issue matches the wiring problem I experienced or if its something else in the temperature monitoring system.

Had my latest service at 187718 KM. After checking with my mechanic, we found the outside temperature sensor was indeed the culprit. The sensor calibration was way off, showing readings 15 degrees lower than actual. The vehicle temperature sensor issue turned out simpler than expected, replacing the sensor solved all the problems. Total repair time was 1.5 hours at 120 Euro for parts and labor. All systems now working normally, AC, mirror heating, and washer nozzles function as they should. Worth noting the sensor malfunction appeared gradually, not suddenly, which apparently is typical for this type of failure. The stored error code helped pinpoint the exact issue.

Thanks for the update on your S5. Its great to hear your temperature monitoring issues got resolved with a straightforward sensor replacement. Your experience matches what I often see with these sensor diagnostics, when multiple temperature-dependent systems act up simultaneously, its usually traced back to the main temperature sensor. The gradual failure pattern you mentioned is indeed typical. Temperature sensors tend to drift off calibration over time rather than fail completely. The 15-degree discrepancy you found during sensor diagnostics is a clear indicator of sensor degradation. The repair cost of 120 Euro seems reasonable for a sensor replacement. Actually spent a bit less on my S4 since it only needed wiring work, but sensor replacement is still cost-effective considering it fixes multiple systems at once. Good call on getting it fixed promptly. Inaccurate temperature sensor readings can affect more than just comfort features, they can impact engine management and fuel efficiency too. For anyone else facing similar symptoms, checking the sensor calibration should be the first diagnostic step.

Thanks everyone who helped diagnose this problem. Just wanted to close the loop on my temperature sensor troubles with the S5. After getting the outside temperature sensor replaced, everything is back to normal. The 120 Euro repair cost was worth it considering all the issues it fixed. The sensor replacement took just 1.5 hours, and now the AC, mirror heating, and washer nozzles all work perfectly. For anyone searching the forum later with similar symptoms, watch for gradually worsening temperature readings. My sensor malfunction showed up as a 15-degree difference from actual temperatures. The car temperature sensor affects multiple systems, so when you see various temperature-related functions acting up together, definitely get the sensor diagnostics done. Appreciate the guidance from those who shared their experiences. The stored error code and symptoms matched what others described, which made the diagnosis much more straightforward.