Mondeo Engine Control Unit Defect

Hey, I also own a Mondeo diesel and had a similar issue recently. Were there any specific fault codes for the ECU, or just a general "ECU failure" message? Did you check the wiring harness for corrosion?

Thanks. The error code was generic, indicating a malfunction within the engine control module. Where should I inspect the wiring harness for corrosion?

Okay, that sounds familiar. My error codes were vague too. The mechanic said it's not always straightforward, and a professional should check the harness. It turned out to be a faulty relay in the ECU. I'd recommend taking it to a trusted shop before you fry something. Saved me a lot of headaches.

I appreciate you confirming that. I had it inspected by a workshop, and they diagnosed a defective main relay. The repair cost 120€, and the issue is resolved. Thanks again for the valuable insight.