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lilian_hunter6

Citan preheating lamp and check engine light problems

I have a Mercedes Citan, 2023 diesel model, with only 5441 km. The preheating lamp stays on, the check engine light is on, and there's smoke during acceleration. Could this be a defective preheating control unit, perhaps a faulty cable or plug?

Summary of the thread

A 2023 Mercedes Citan with 5441 km had issues with the preheating lamp and check engine light staying on, accompanied by smoke during acceleration. The problem was suspected to be a defective preheating control unit or faulty cables or plugs. After taking the vehicle to a workshop, the diagnosis confirmed a defective preheating control unit due to an issue with the electrical connector, which was repaired, resolving the issues.

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4 comment(s)

THeldFan

Sounds familiar. I had a similar issue with my Citan, though I didn't see smoke. Preheating lamp wouldn't go off, engine light popped on. Did you check the connections to the heating module itself? Is there any visible corrosion or damage to the wiring harness? Could be a simple electrical fault.

lilian_hunter6 (community.author)

I visually inspected the connections, but I did not see anything obvious. Where is the heating module located? Is it possible to test the connections with a multimeter, or is that too risky without proper diagnostic equipment?

THeldFan

Tracing car electronics issues can be a pain without the right tools. The heating module is usually near the engine block. You could try a multimeter, but you might end up doing more harm than good. My advice? Take it to a workshop. They'll diagnose it properly and save you the headache. Could be a defective part, like the car preheater itself.

lilian_hunter6 (community.author)

I took the vehicle to a workshop. The diagnosis confirmed a defective preheating control unit, specifically an issue with the electrical connector. The repair cost 95€. This resolved the preheating lamp and check engine light issues.

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MERCEDES

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CITAN