If your Mercedes has the rain/light sensor for the windshield wipers and it starts acting up, changing out the sensor is quick and easy. The sensor is attach
The following guides explain how to reset the tyre pressure system for UK and USA models of the Mercedes C-Class. Mercedes C-Class W204 Tyre Pressure Reset. Use this guide to reset the tyre pressure monitoring system (TPMS) for the Mercedes-Benz C-Class W204 (2007 – 2014) UK version. Make sure that the tyre pressure is correct on all four wheels.
Cruise control inoperative is a common problem on Mercedes-Benz C300 W204, but this problem can affect any 2000 and newer Mercedes-Benz, including E-Class, S-Class, ML-Class, GL-Class, GLS-Class, R-Class, GLE-Class, etc. Cruise controls only work at speeds above 25 mph. Symptoms
This works for my 2009 W204: key: Button A is "R" button (bottom left) Button B is "Menu" Button (top left) Button C is "+" button (top right) Turn ignition key to position I. Repeatedly press button to display odometer. First, you have to make sure that the odometer is showing on your display, otherwise it won't work. Then you push the call answe button first, and a split secod later you push OK. Then you hold them both for a few seconds, then you go on from there. Let us know if it worked. Thanks - It worked like a charm.