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Peugeot 407 outside temperature sensor issues

I've got a 2009 Peugeot 407 (gasoline engine) with 297515 km. The outside temperature sensor seems faulty. I'm getting an error code, the AC won't kick on, the windshield washer fluid is freezing even when it's not that cold, and the mirror heating isn't working. From what I've read, it's likely a cable or connector issue. Anyone seen this?

4 comment(s)

Sounds familiar. I have a 407 too. I had similar symptoms – the AC refusing to work was the most annoying thing. When you say 'error code', which one are you getting? An outside vehicle temperature sensor reports the ambient air temperature to the car's computer, which controls the air conditioning, defogging, and other climate-related functions. A faulty sensor tells the computer the incorrect temperature, or no temperature, or an implausible one, causing all sorts of issues.

Thanks! Sorry, forgot the code. It's P0070 - Ambient Air Temperature Sensor Circuit Malfunction. Did yours throw the same code?

Yep, P0070 rings a bell. Honestly, I fiddled with it for a bit, checking the wiring near the sensor (it's usually behind the front bumper), but I eventually gave up and took it to a workshop. It wasn't worth the headache for me.

Thanks for the info! Ended up being exactly what was suspected: corroded connector. 95€ later all the systems are working again.

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