How do you change a main beam bulb in an alfa romeo 147?

To change the main beam bulb in an Alfa Romeo 147, first, open the hood and locate the back of the headlight assembly. Disconnect the electrical connector from the bulb and remove the rubber cover, if present. Twist the bulb holder counterclockwise to release it, then carefully pull out the old bulb and insert the new one, ensuring it is securely in place. Finally, reattach the bulb holder, reconnect the electrical connector, and replace any covers.