Fiorino fuel filter heater error

Interesting. I had something similar with my Fiorino, although I didn't see the fuel consumption spike as dramatically as you describe. Is the error persistent, or intermittent? Have you probed the wiring harness and connector to the fuel filter heater for continuity and voltage drop under load? It's like chasing a ghost sometimes, but those fuel systems can be very sensitive to voltage fluctuations.

The error comes and goes, but the performance issues are pretty consistent. I haven't dug into the wiring that deeply yet – mostly visual inspection. You mentioned voltage drop; any specific wires or pins I should focus on? I've heard these can be tricky, like finding a needle in a haystack.

Precisely! Given the intermittent nature and your symptoms, focus on the connector itself. Corrosion or a loose pin is likely the culprit. Think of it like a loose connection on a Christmas tree light – sometimes it works, sometimes it doesn't. However, without the proper diagnostic tools, it can be challenging to pinpoint the exact location of the fault. At this point, I'd suggest a workshop visit.

Thanks, I appreciate the insight. It ended up being a corroded connector on the fuel filter heater circuit, just like you suspected. A quick clean and contact spray fixed it, but I had the workshop replace the plug. Cost me 95€. Runs like new now!