Viano fog sensor malfunction and related issues

It sounds like a central issue affecting multiple systems. A faulty humidity sensor, integrated with the fog sensor, can disrupt climate control. If the system isn't regulating temperature correctly, frozen washer nozzles and mirror heating could be linked. 95€ sounds reasonable for a wiring or connector issue. Did the error code specifically point to the fog sensor, or was it a general climate control error?

The error code references the fog sensor specifically. Could simply disconnecting and reconnecting the plug be a good first step before replacing the entire sensor?

Since the error code pinpoints the fog sensor, checking the connection is a good first step. The connector could be loose or corroded. Given the related issues, the sensor itself might be faulty. Cleaning the contacts might help temporarily, but a failing sensor will likely cause the issue to return. A workshop visit might be the best way to properly diagnose and resolve the problem.

I took the vehicle to a workshop. The sensor was defective and required replacement. The final cost was in line with the estimate. The dashboard warning is gone, the air conditioning functions, and the mirror heating is restored.