How do you replace the headlight bulb on a 2000 Audi TT?

To replace the headlight bulb on a 2000 Audi TT, first, open the hood and locate the back of the headlight assembly. Disconnect the electrical connector from the bulb and then twist the bulb socket counterclockwise to remove it. Replace the old bulb with a new one, being careful not to touch the glass with your fingers, and then reassemble by reversing the steps. Finally, test the new bulb to ensure it's working properly.