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AntonWag91

Peugeot 4007 Rain Sensor Fault

I have a 2009 Peugeot 4007 with a gasoline engine and 294668 km. I'm seeing symptoms of a rain-light sensor fault. There's an error stored, no automatic wiping in rain, no auto headlight control, speedometer dimming doesn't work, and the lights are always on. Has anyone seen this and have diagnostic or solution recommendations?

Summary of the thread

A 2009 Peugeot 4007 exhibited symptoms of a rain-light sensor fault, including non-functional automatic wipers, auto headlight control issues, and constant headlight activation. The problem was suspected to be caused by bubbles in the gel pad of the rain sensor, which can distort sensor readings. The solution involved replacing the faulty rain sensor, which resolved the issue.

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4 comment(s)

patriciastorm1

Sounds like a dodgy rain sensor. Have you checked the gel pad on the windshield? They're notorious for getting bubbles which messes with the sensor readings. Those bubbles act like tiny prisms, scattering light and giving the sensor bad data. Is the windshield original, or has it been replaced? Aftermarket windshields can sometimes cause issues too, if they're not perfectly aligned with the sensor.

AntonWag91 (community.author)

Thanks. Can I visually inspect the gel pad without taking the sensor housing apart? The windshield is original to my knowledge. How can I confirm your suspicion and check the windshield's alignment?

patriciastorm1

You can usually spot the bubbles just by looking closely at the sensor area from outside the car. If you see distortions or cloudiness under that gel, that's probably it. If it's the original windshield and you've got bubbles, you're probably looking at a new sensor or a fiddly repair job with new gel. Alignment is harder to check yourself. A workshop with diagnostic tools can tell you for sure. Might be worth getting it scanned.

AntonWag91 (community.author)

I inspected the gel pad and found bubbles. I had the rain sensor replaced by a workshop for 62€. The issue is now resolved. Thanks for the help.

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PEUGEOT

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4007