S Klasse Hybrid emergency call malfunction

I might be able to help. I remember reading about something similar on the Mercedes C Klasse forums. Automotive electronics can be a bit all over the place, but maybe try a system reset? Disconnect the battery for about 30 minutes. That can clear glitches. Did the call failure happen after something specific?

Are there risks involved in disconnecting the battery, particularly concerning the car's electronic systems or stored settings? Also, can you specify which incident you are referring to?

A system reset could mess with some settings, I'm not totally sure. As for the incident, I was thinking maybe it happened after a car wash or repair work. I read somewhere it may have been a loose wire. With the SOS signal affected, I'd take it to a workshop to check the car safety systems.

I appreciate the advice. Given the potential complexities and safety implications, I visited the workshop for diagnosis and repair. It was indeed a defective plug connection, and the repair cost was 95€. Thanks again for your assistance.