Depends on the model year.
Basically, navigate the window display to the service indicator notice.
Press and hold the "R" button (on the left side of the instrument cluster)
When the window acknowledges that you wish to reset the service interval it will ask you for one push of the "R" button. Push the "R" button once and you should be reset.
You will need a reset tool to reset the service indicator on the Mercedes e240. You will reset the indicator by using the buttons on the dash.
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i Dont have a clue
como resetear
Press the brake
google ( mercedes-autobestanswer) details there.
The owners manual outlines the procedure for reseting the service indicator.