How to clear codes on a Mercedes?
Disconnect the battery: Turn off the ignition and disconnect the negative terminal of the battery. Wait 10–15 minutes, reconnect, and restart the engine. This can clear the system memory in some models. How to Reset a Check Engine Light Without a Scanner. Disconnecting the negative battery cable for a few moments will force your Mercedes-Benz vehicle’s diagnostic systems to recalibrate.Disconnect and Reconnect the Battery Turn off your Mercedes-Benz and open the hood. Disconnect the negative battery terminal using a wrench. Wait for about 15 minutes to allow the system to reset. Reconnect the battery terminal, ensuring it is securely tightened.