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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como resetear
Press the brake
google ( mercedes-autobestanswer) details there.
The owners manual outlines the procedure for reseting the service indicator.
To reset the service information on a 2005 Mercedes-Benz CLK500, turn the ignition key to the "On" position without starting the engine. Press the gas pedal three times within five seconds. Then, turn off the ignition and start the engine to complete the reset process. This should clear the service reminder from the display.