The Ford Focus is equipped with halogen headlight bulb inserts, which project light farther and brighter than older sealed beam headlight bulbs. If one or both of the bulbs should burn out, replace them immediately. Replacing the headlight bulbs on a Ford Focus is one of the easier do-it-yourself maintenance projects a Focus owner can undertake. This job requires no prior auto repair experience and takes under ten minutes to accomplish.
Turn the headlamp switch off. Open the bonnet and reach down behind the headlamp assembly containing the blown headlight bulb.
Remove the headlight bulb socket cover by hand. It simply pulls off.
Grab the socket retaining ring and turn it counter-clockwise.
Pull the bulb and socket straight backward, out of the headlamp assembly.
Pull the old bulb straight out of the socket by hand. Wrap the clean rag around the new bulb, using care not to touch it with your bare skin, and push the new bulb into the socket.
Insert the new bulb and socket back into the headlamp assembly. Turn the retaining ring clockwise to seat it, and push the socket cover back into place.
Never touch the halogen bulbs glass with your skin or allow anything to touch it besides the clean rag. Oils from your skin become superheated when the headlamps are turned on, burning out the halogen bulb in an instant.