How do you reset the service indicator on a Mercedes?
This may take a couple of trys.
Make sure the doors are shut.

1) Turn key to position 2.
2) Press/release the R button to show the next service due light. Release
button.
3) Turn key to Off.
4) Press and HOLD the same R button to view the service light, THEN, within
2 seconds, turn key to position 2.
5) Wait up to 10 second and the light will reset to show new service