christopherrichter23
C4 collision avoidance error
Summary of the thread
A 2008 Citroen C4 diesel was experiencing an error message and warning light, suspected to be related to the collision avoidance system's radar sensor. The issue was likely due to a dirty sensor, which can affect other systems. Cleaning the sensor resolved the problem, eliminating the errors.
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4 comment(s)
christopherrichter23 (community.author)
Yeah, I thought about that. Where exactly is the radar sensor located on the C4? I want to give it a look and see if I can clean it before taking it in.
maratiger9
It's usually behind the front bumper, often near the lower grille. Be careful when cleaning it. Don't use anything abrasive, and avoid high-pressure water. If cleaning doesn't fix it, the sensor might need recalibration or replacement, which is best left to a workshop.
christopherrichter23 (community.author)
Thanks! Turns out you were right, it was just a dirty sensor. Gave it a gentle wipe and all the errors are gone. Cost me 45€ for the cleaning at my friend's workshop. Appreciate the help!
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CITROEN
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C4
maratiger9
Sounds like a faulty or dirty radar sensor. These sensors are quite sensitive. Is the front of the car particularly dirty or have you driven through heavy rain or snow recently? Sometimes a simple clean can sort it out.