S80 Fog Sensor and Electrical Issues

I've got a 2004 Volvo S80 with a gasoline engine and a strange problem. The fog sensor seems to be malfunctioning. I'm getting an error stored. Also, the air conditioning system doesn't switch on, the spray nozzles are frozen at cold temperatures, and the mirror heating is non-functional. I suspect a defective cable or plug connection. Has anyone experienced anything similar?

4 comment(s)

I had a similar issue with my S80. Check the sensor connections first. The CEM (Central Electronic Module) might be involved too, so check for any corrosion or loose connections there. Is your dashboard warning light on?

Thanks for the tip! I'll check the CEM. Yes, the dashboard warning light is on. Do you remember which sensor connections you checked specifically? And did you have to do any kind of sensor calibration afterwards?

Yes, it was the fog sensor connection itself, the one near the rearview mirror. I didn't calibrate anything, but the shop guys told me that the error code indicated some problem with the sensor circuit. To be safe, I’d recommend taking it to a workshop; the diagnostic alone is worth it, and my fix cost about 95€ to sort it all out.

Appreciate the help! I'll check the connections you mentioned, and probably head to a workshop to get a proper diagnosis. Sounds like that's the best bet. Just got the Volvo back. Turns out it was exactly what we suspected: cable or plug connection defective. Cost me 95€ as well to fix. Thanks again!

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