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melinamond42

Mondeo preheating fault

My '06 Ford Mondeo diesel is throwing a fit. Preheating lamp stays on, check engine light's mocking me, and it's puffing smoke when I put my foot down. My scanner's showing a dodgy preheating control unit. Checked the basics, seems like a cable or plug connection is shot. Any ideas before I torch the thing?

Summary of the thread

The '06 Ford Mondeo diesel is experiencing issues with the preheating system, indicated by a persistent preheating lamp, check engine light, and smoke emissions. The diagnostic code P0670 suggests a malfunction in the preheating control circuit, likely due to a faulty connection. The problem was resolved by addressing a faulty connection to the heater control unit, costing 95€.

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4 comment(s)

elias_eis1

The symptoms you describe are indeed indicative of a potential malfunction within the preheating control system. Could you please provide additional information regarding the diagnostic trouble codes (DTCs) retrieved by your scanner? Furthermore, have you conducted a thorough inspection of the wiring harness and associated connectors for signs of corrosion, damage, or loose connections?

melinamond42 (community.author)

The code I pulled was P0670 - Preheating control circuit malfunction. I've given the plugs a wiggle and a prod, but nothing obvious jumps out. By any chance are there any usual culprits I should be checking more carefully on this heap?

elias_eis1

Based on the diagnostic trouble code P0670 and your description of the troubleshooting steps undertaken, it is probable that the root cause of the issue resides within the preheating control unit itself or the associated wiring. While further diagnostics may be performed, it is recommended to seek the counsel of a qualified automotive technician for comprehensive evaluation and repair.

melinamond42 (community.author)

Took it to a garage and as suspected it was a faulty connection to the heater control unit. Sorted for 95€. Thanks for confirming my suspicions!

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FORD

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MONDEO