Peugeot 3008 Battery Sensor Issue

Sounds familiar! I had a similar issue with my 2016 Opel Astra. Constant low battery warnings, weird electrical issues popping up. I initially suspected the alternator, but it turned out to be a faulty battery sensor constantly draining the battery. Have you checked the battery terminals for corrosion or loose connections? Also, have you had the battery charging system tested?

Thanks for the quick reply! Corrosion is minimal, and the connections seem tight. I haven't had the charging system properly tested, just a quick voltage check with a multimeter, which seemed okay-ish. When you say 'battery sensor', are we talking about the IBS (Intelligent Battery Sensor), or something else? How did you eventually diagnose it?

Yep, I'm talking about the IBS. My mechanic plugged in his fancy diagnostic tool, and it showed the IBS was reporting wildly inaccurate data, causing the car to overcharge and then drain the battery. Honestly, unless you've got access to proper diagnostic gear, it's a pain to pinpoint. I'd suggest taking it to a workshop. They can properly diagnose the issue and save you from randomly replacing parts.

Okay, that's the confirmation I needed. Workshop it is! Thanks a million for sharing your experience. It WAS the battery sensor, just like we thought! Cost me 315€ to get it sorted, but at least the Peugeot's back on the road and the disco lights are gone. Cheers!