How do you replace headlight bulb for Mercedes MB140d?

To replace the headlight bulb on a Mercedes MB140d, 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. Disconnect the electrical connector from the old bulb, twist it counterclockwise to remove, and then insert the new bulb by reversing the process. Finally, reconnect the electrical connector and test the new bulb before closing the hood.