XC40 Fog Sensor Error

Greetings. The symptoms you describe are indeed consistent with a malfunctioning fog sensor. However, before definitively concluding that a cable or plug connection is the sole culprit, have you attempted to perform a diagnostic scan to ascertain the specific error code being registered? Furthermore, has the sensor's calibration been verified to ensure it falls within acceptable parameters?

Good questions. I have the error code stored, yes. As for the calibration, is that something I can check myself without specialized tools? Or is it a 'leave it to the pros' kind of thing?

Considering the interconnected nature of modern automotive systems, and given the constellation of issues you are experiencing, it would be prudent to have a qualified technician conduct a thorough inspection. While certain diagnostic procedures can be performed by individuals, the calibration of a fog sensor often necessitates specialized equipment. The potential repair cost you mentioned appears reasonable, especially if it addresses all the identified issues. It is advisable to proceed with a professional assessment to preclude any unforeseen complications.

Appreciate the advice! Took it to the shop. Turns out it was indeed a corroded connector on the fog sensor harness. 95€ later, everything's back up and running. Thanks again!