How do you replace the headlight bulb on a Audi A8?

To replace the headlight bulb on an Audi A8, first, ensure the vehicle is off and the keys are removed. Open the hood and locate the headlight assembly; you may need to remove the plastic cover or access panel. Disconnect the electrical connector from the bulb, twist the bulb socket counterclockwise to remove it, and then replace it with a new bulb, taking care not to touch the glass. Reassemble everything by reversing the steps and testing the new bulb.