Audi S1 Climate Control Failure: Temp Sensor Alert

Having some experience with HVAC sensor problems, I faced a similar issue with my 2013 Audi S3. The temperature control system showed the same symptoms, and the climate regulation became completely unresponsive. After several failed attempts to reset the system, I took it to a workshop. The diagnostic revealed a faulty cable connection at the interior temperature sensor. The technician found that the wiring harness connector had become loose over time, causing intermittent temperature reading errors. The fix involved reconnecting and securing the sensor plug, plus cleaning the connection points. Total repair cost was 95 Euro, mostly labor. The whole process took about an hour, and the temperature control system has worked flawlessly since then. To help diagnose your specific case, could you share: Are you getting any specific error codes? Does the display show any temperature readings at all? Did the issue start suddenly or develop gradually? Have you noticed any unusual sounds from the HVAC system? This would help determine if your S1 has the same underlying issue or if its something else in the climate control system.

Thanks for the detailed response. My last service was actually just 2 weeks ago at 113098 KM, and they didnt catch this climate control issue. The error code is P0533 which points to the AC pressure sensor, but the HVAC sensor diagnostics also showed a temperature reading fault. The display still shows temperature readings, but they seem incorrect and fluctuate out of nowhere. The climate regulation system stopped working rather suddenly, one morning the AC just wouldnt respond at all. No unusual sounds from the system though. Checking the wiring connections sounds like a good starting point before replacing any sensors. Will have the technician look specifically at the connectors during the inspection.

Thanks for providing those additional details about your S1. Based on your description and error code P0533, your issue seems more complex than what I encountered with my S3. While my problem was resolved with a simple wiring fix, the combination of the AC pressure sensor code and temperature reading faults suggests you might be dealing with multiple sensor issues in the climate control system. The unusual temperature reading fluctuations are particularly telling. While a loose connection can cause this, the presence of the P0533 code indicates the AC pressure sensor could be the primary culprit, affecting the entire HVAC system operation. Since your last service was so recent, it might be worth contacting the same workshop. Given that sensor diagnostics show both pressure and temperature reading problems, they should check: The AC pressure sensor and its wiring, All temperature sensor connections, The entire HVAC control module for communication issues In my case, the repair was straightforward and inexpensive. However, if you need the AC pressure sensor replaced, expect costs between 150-300 Euro depending on labor rates. The good news is that these sensor issues, while annoying, are typically straightforward to fix once properly diagnosed.

Thanks for the input. After taking it back to the workshop, they performed a complete sensor diagnostics check on the climate control system. Turns out it was indeed a combination of issues, a faulty AC pressure sensor and a loose connection in the temperature sensor wiring, just as suggested. The total repair included replacing the pressure sensor and rewiring the temperature sensor connections. Final cost was 275 Euro including parts and labor. The climate regulation is now working perfectly again, with accurate temperature readings and proper AC function. For anyone else experiencing similar issues, definitely have them check both the pressure and temperature sensors, as problems with one can affect the entire system. My case shows that sensor issues can be interrelated and its worth getting a complete diagnostic rather than just assuming its a single component failure.