Peugeot 208 fuel filter heater issue

Sounds like the fuel filter heater circuit indeed. Has the fuel filter been replaced recently? A faulty filter itself can sometimes cause weird electrical issues. Also, what exactly does the error code say? That might give us a more specific direction to look in.

Filter was replaced about 6 months ago. I need to check the error code again. Where exactly should I be checking for the connections? I'm handy with a multimeter, just need some pointers.

Okay, new filter should rule that out then. Definitely grab the error code. As for the connections, focus on the plug going directly into the fuel filter heater and trace the wiring back as far as you can easily see. A visual inspection for corrosion or damage is key. Honestly, though, with electrical gremlins, sometimes it’s best to get a pro to diagnose it properly. Could save you a lot of time and frustration.

Cheers. Error code pointed to the heater circuit. Took it to a shop, and it turned out to be a corroded plug. 95€, and she is flying again!