Fusion Fuel Filter Heater Error

Sounds like you've done some good initial diagnostics. The fuel filter heater circuit is a common point of failure. Have you checked the voltage at the heater connector with the engine running? Also, inspect the connector itself for corrosion or damaged pins. Sometimes, a bad ground can also mimic these symptoms. Filter replacement is a reasonable first step if the element is old anyway.

Thanks for the reply. I haven't checked the voltage directly at the connector yet, but that's a good call. Where is the ground located for the heater circuit? I want to check this before considering a filter replacement right away.

The ground is usually located near the fuel filter housing, often bolted to the chassis. However, without a wiring diagram specific to the 2002 Fusion diesel, I can't pinpoint the exact location. Given the symptoms and the error code, a defective cable or plug connection of the component is very likely. If you're not comfortable tracing the wiring yourself, it might be best to take it to a workshop with experience in diesel fuel systems. They can diagnose it quickly and accurately.

OK, appreciate the advice. I'll trace the ground first, but it seems I'll be heading to a workshop. The diagnosis ultimately pointed to exactly what you suggested: a corroded connector. Repair cost was 95€ including parts and labor.