How do you change the front sidelight bulb on a citroen c4?

To change the front sidelight bulb on a Citroën C4, 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 a cover or access panel. Carefully twist the bulb holder counterclockwise to release it, replace the old bulb with a new one, and then reassemble everything by reversing the steps. Always check that the new bulb is functioning before closing the hood.