I have a 2000 C180 and the owners handbook says - To reset the service
Turn the electronic key to position 2 in the starter switch and immediately
press the 0 button twice within one second.
Turn the electronic key to position 0 in the starter switch.
Press and hold the 0 button. Turn the electronic key to position 2 in the
starter switch, keep the 0 button pressed.
The service indicator with the current remaining distance or period appears.
After about 10 seconds, an acoustic signal will sound and the service
indicator with the new starting distance or starting time appears for about
Release the 0 button.
You can try the above as I would think that the process is the same for all
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.