S40 Fog Sensor Issues

I've got a 2002 Volvo S40 with a gasoline engine and I'm running into a strange issue. My fog sensor seems to be acting up. I'm getting an error stored, the air conditioning won't switch on, the spray nozzles are freezing, and the mirror heating isn't working. Could a defective cable or plug connection really be the culprit? Has anyone else experienced this?

4 comment(s)

Sounds familiar! I have an S40 myself. I had a similar set of problems a while back. Have you checked the sensor calibration, or maybe the humidity sensor itself? Is the error code specific to the fog sensor, or is it more generic?

Thanks for the quick reply! I haven't checked the sensor calibration, to be honest, I'm not even sure how to do that. As for the error code, it does specifically mention the fog sensor malfunction. Could a simple recalibration really fix all those symptoms? Seems like a lot!

Hmm, a specific fog sensor error and all those other issues... yes, I experienced precisely the same with my S40. Considering everything you've described, and the fact that the error is fog sensor specific, I'd advise taking it to a workshop. I ended up paying about 95€ for them to sort out the electrical issue. Saved me a lot of time and potential further problems.

Okay, thanks for confirming. I suspected it might be more than I could handle myself. I'll book it in with a local garage and hopefully, it will be a simple fix like yours. Cheers!

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