How to reset service warning light?
To reset your car’s service light warning in the UK, turn on the ignition without starting the engine, press and hold the trip reset button until the warning light flashes, then start the engine and repeat if necessary. Quite simply, the only guaranteed way to reset the Mercedes service message is to get the vehicle correctly and professionally serviced. To be honest, if you’re going to the expense of owning and driving a Merc, why would you want to take shortcuts when it comes to maintaining it?
How do I clear a message on my Mercedes?
Push the ignition once, see the dials do a sweep around. Hold down the phone button and then hold the OK button to bring up the Vehicle Data menu. Release both buttons and, using the scroll down button, highlight the ASSYST PLUS on the menu. Press OK. With the key out of the ignition find and press the odometer reset button (hold down) Turn the ignition on (warning lights come on) wait about 10-15 sec until most or the lights are off (still pressing odometer reset button) Turn ignition off (button still pressed) and remove the key.