Mercedes C Klasse Hybrid Stalling at Idle

I had a similar issue on my C Klasse, though it wasn't a hybrid. Check engine light and rough idling. Have you considered fuel contamination? Modern engines are sensitive. It could be bad fuel, water in the tank, or even the wrong octane. When did you last change your fuel filter?

Fuel contamination is a possibility. Can you tell me more about what fixed the problem on your car? Did you experience combustion chamber issues or have to deal with fuel additives?

For me, it ended up being a faulty sensor connection related to the fuel system. The computer was getting bad data and adjusting the fuel mixture incorrectly. Since you've already pinpointed a possible cable or plug issue, that's probably it. I still advise a workshop visit to be certain.

The cable connection to the fuel composition sensor was indeed the problem. I cleaned the contacts and reconnected it. The error is cleared, and it runs smoothly now. The estimated cost of 95€ was accurate.