To replace the headlight bulbs in a 2004 Pontiac GTO, first, open the hood and locate the back of the headlight assembly. Disconnect the electrical connector from the bulb, then twist the bulb socket counterclockwise to remove it. Replace the old bulb with a new one, being careful not to touch the glass part, and then reassemble by twisting the socket back in and reconnecting the electrical connector. Finally, test the new bulb to ensure it’s functioning properly.
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