2012 Mercedes-Benz S550 Q&A
2012 Mercedes-Benz S550 Question: Service light
Turn key to ignition 1, press and hold telephone answer and OK button for 4 seconds, the telephone should be pressed first. The menu should come up. Scroll down the menu and reset and confirm all services done. Your Welcome. - ProfessorG
The camshaft adjuster solenoid (which is related to the variable valve timing system) may fail or timing chain/balance shaft components may wear, resulting in illumination of the Check Engine Light...
The engine may develop a stalling and/or no start condition due to a failed crankshaft position sensor.