Q4 e-tron HVAC Sensor Malfunction After 6K Miles

Had the same issue on my 2020 Audi e-tron GT. The car fault detection system showed similar symptoms with inconsistent HVAC performance. The sunlight sensor malfunction triggered incorrect temperature readings, causing the climate control to behave erratically. At the repair shop, diagnostic testing revealed a loose cable connection at the automotive sensor array. The main HVAC sensor cluster needed recalibration after securing the connection. While not a major mechanical problem, proper diagnosis was crucial since similar symptoms can indicate more serious electronic control unit issues. The repair process involved: Full diagnostic scan, Testing the sunlight sensor functionality, Checking all related cable connections, Recalibrating the HVAC sensor system, Verifying proper communication between components Getting a second opinion is reasonable if unsure about the diagnosis. A qualified Audi service center with experience in electric vehicle car sensor systems would be best equipped to handle this issue properly.

Thanks for sharing your experience. My car also showed those exact symptoms last winter. After the repair shop fixed the loose connection and recalibrated the HVAC sensor system, everything works perfectly now. Great to hear I wasnt the only one with this temperature sensor issue. Can you remember what the total repair cost was? Also wondering if you had any other sensor fault codes pop up since getting it fixed?

Thanks for asking about the repair costs. The solar sensor fault was completely resolved with the fix, no other automotive sensor codes since then. The bill came to 95 Euro for diagnosing and fixing the faulty cable connection. Pretty straightforward repair considering how much trouble the malfunctioning sunlight sensor was causing the HVAC system. The fault detection system hasnt flagged any issues since the repair. The climate control now responds correctly to temperature changes and sunlight conditions. If you experience any other sensor-related problems, definitely get it checked promptly to avoid potential complications with the HVAC system.

Thanks for the helpful responses everyone. Finally took my Q4 to a certified shop last week. The entire sensor calibration process took about 2 hours. Total cost was 180 Euro including diagnostic tests and repairs. Glad I went with a specialized shop, they quickly identified the loose connection and performed proper HVAC sensor adjustments. No temperature sensor warnings since the fix and the heating works perfectly again. The detailed fault detection readout they provided showed exactly what was wrong. Much better experience than my previous mechanic who couldnt properly diagnose these sensor issues. Really appreciate the advice about getting it checked by EV specialists. Saved me from potentially bigger problems down the road.