Peugeot 207 battery sensor issue

Interesting. I had similar symptoms with my Peugeot 207, although it's an older model. Weak starts and flickering lights – sounds like a battery issue, right? The battery charge wasn't consistent, and sometimes it struggled to turn over. Have you checked the battery terminals for corrosion? A poor connection can cause those symptoms. Even if the battery is relatively new, these cars are quite sensitive to voltage drops. A failing alternator could also cause similar symptoms, so it's worth ruling that out before blaming the sensor.

Thanks for the quick reply! The terminals are clean. I measured the voltage at the terminals with a multimeter (engine off, engine on), and performed a simple battery testing. Everything appeared normal from the multimeter, and that's why I suspect the sensor. How did you pinpoint the battery sensor as the problem source? Any particular vehicle diagnostics steps taken, or specific error codes?

Ah, if you've already checked the voltage and terminals, and suspect the sensor based on diagnostic codes, then it does seem likely. In my case, I didn't dive as deep into diagnostics as you have; my mechanic suggested it after I described the symptoms. He explained the sensor regulates battery health, and a faulty one can mess with the charging system. It might be worth consulting a workshop or experienced mechanic to confirm the issue and get a quote; they have better tools. The repair might cost in the neighborhood of 315€. Better than potentially chasing down phantom electrical gremlins yourself!

Appreciate the advice; it sounds like our experiences align quite closely. I will take it to my local mechanic this week, and ask them to confirm my findings as you suggest, and replace the sensor. Thanks for confirming my reasoning, and relating your experience with your 207.