Peugeot 5008 Diesel Fuel Filter Heater Issue

Sounds like it could be the fuel filter heater, yeah. Is the engine light on? Have you tried clearing the error code to see if it comes back?

The engine light stays on even after clearing the code; it returns right away. Why do you suspect the fuel filter heater? What diagnostic steps should I take before replacing it?

The symptoms point to it, plus you mentioning the stored error. Honestly, without proper tools, it's tough to pinpoint. A workshop visit is probably best. They can check the heater's function and wiring properly.

I consulted a technician, and it was a defective cable connection to the fuel filter heater. The 95€ repair fixed everything. Thanks for pointing me in the right direction.