Seat Arosa HVAC Sensor Problem

It sounds like you've done some good initial sensor diagnostics. The symptoms you describe certainly point towards a faulty HVAC sensor or its wiring. The error code being stored is another strong indicator. Have you checked the sensor's plug connection for any visible corrosion or damage? Sometimes it's as simple as a loose connection causing climate issues.

Thanks for your reply. I did visually inspect the plug, but I didn't see any obvious corrosion. Is there a way to test the sensor itself or the wiring with a multimeter, perhaps? I am not sure where to start.

Given that you've visually inspected the plug and are still experiencing issues, and you lack of the appropriate sensor diagnostics tools, it's likely the fault is more complex than a simple visual check can reveal. While testing with a multimeter is possible, it can be tricky without the correct wiring diagrams and knowledge of the sensor's expected values. In your case, it is similar to performing surgery with a butter knife. Considering the symptoms and error code, I would recommend taking it to a workshop for proper diagnosis and repair. It will likely save you time and potential further damage.

Thank you for the confirmation and advice. I took it to a workshop, and they confirmed the cable to the HVAC sensor was indeed faulty, just as you suspected. They replaced the cable and plug connection, and the air conditioning is working again. The final bill was 95€, which is within my budget. I appreciate your help!