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isabell_knight5

C8 Fog Sensor Error

I'm getting a persistent fog sensor error on my 2002 Citroen C8 diesel (118256 km). It's causing the AC to not work, frozen spray nozzles, and inoperative mirror heating. Error is stored in the memory. I suspect a defective cable or plug. Anyone seen this?

Summary of the thread

A 2002 Citroen C8 is experiencing a persistent fog sensor error, leading to non-functional AC, frozen spray nozzles, and inoperative mirror heating. The error code B1004 suggests a malfunction in the relative humidity and temperature sensor circuit, possibly due to a defective cable or plug. A similar issue was resolved by taking the vehicle to a workshop, where it was fixed efficiently, suggesting professional intervention as a viable solution.

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4 comment(s)

dirkpeters1

Whoa, sounds familiar! I've got a C8 too. Had almost the exact same weirdness last winter - the AC refusing to kick in was the first sign, then the heated mirrors went AWOL. I didn't even realize the washer nozzles were frozen until I tried to use them. Fog sensor thingy, huh? Where'd you track it down to that? What error code are you seeing?

isabell_knight5 (community.author)

The code is B1004, indicating a malfunction in the relative humidity and temperature sensor circuit. I'm thinking it's the cable or plug because multiple systems are failing. How did you resolve your issue, and what did you check?

dirkpeters1

Okay, B1004 rings a bell now. I messed around trying to clean the sensor and checking the fuses but no luck. To be honest, I got frustrated pretty quick and took it straight to a workshop. They sorted it out in a couple of hours. Seems like your problem is the same I had. My suggestion is to go to the workshop and let them solve it. You are probably looking at 95€.

isabell_knight5 (community.author)

I appreciate you sharing your experience. Based on your recommendation, and considering the diagnostic information, I'll take it to a technician. I'll post the solution for others later. Thanks again!

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CITROEN

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C8