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V Klasse preheating issue

My 2012 Diesel V Klasse has a suspected preheating control unit malfunction at 83441 km. The preheating lamp stays on, the check engine light is lit, and there's smoke during acceleration. I suspect a cable or plug issue. What are the diagnostic steps for this electrical fault with the heating module? I expect the repair to cost around 95€.

4 comment(s)

I had a similar issue with my V Klasse. The preheating light stayed on, and the engine acted up. It was a bad connection to the glow plugs, like a loose wire on a lamp. Did you check the glow plugs themselves? They might be the problem.

Can you tell me where the glow plugs are and how to check if they are working? I want to learn more about the ignition system.

The glow plugs are usually screwed into the cylinder head, near the injectors. Checking them needs tools. It's like checking the voltage on a battery, but you're testing the glow plugs' resistance. If you're not comfortable, a workshop can pinpoint the issue and might save you trouble.

I consulted a workshop, and they confirmed a faulty connection to the preheating control unit, as suspected. The repair cost was about 95€, and it fixed the problem. Thanks for the help.

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