How do you replace the low beam head lamp of 2010 s550 Mercedes?

To replace the low beam headlamp on a 2010 Mercedes S550, first, ensure the vehicle is turned off and the keys are removed. Open the hood and locate the headlight assembly; you may need to remove the cover or access panel on the back of the assembly. Disconnect the electrical connector from the old bulb, twist the bulb counterclockwise to remove it, and then insert the new bulb by twisting it clockwise. Reconnect the electrical connector and replace any covers before testing the new headlamp.