Territory Fuel Filter Heater Fault

I had a similar issue with my Territory (though it's a slightly different year). Same engine. Reduced engine power and rough idle were the initial signs. Have you checked the fuel lines for any visible damage or blockages? A damaged fuel line could also cause similar symptoms and potentially trigger a fuel filter heater error due to pressure fluctuations, which would be detected by the engine control unit. Is the engine stalling?

Thank you for the information. I have visually inspected the fuel lines and found no obvious damage. Engine stalling has not occurred, but the other symptoms persist. Could you elaborate on the potential electrical issues associated with the fuel filter heater itself?

Certainly. In my case, I initially focused on potential fuel line issues as well. When I mention electrical problems, it means that the fuel filter heater is a small electric heater warming up diesel to improve cold start performance. Considering the stored error code specifically mentions the heater circuit and you haven't found a mechanical issue, there is a strong chance your suspicion of a faulty connection is correct. Replacing it might solve it, but I'd suggest you consult a workshop for diagnosis and proper repair anyway. It might save time and further expenses.

I appreciate your advice. I have inspected the contacts and will seek professional assistance at a workshop for proper repair, which is estimated at approximately 95€. Thank you for your insights.