Ford's Focus uses a Halogen H7 bulb in its low-beam socket. Open the bonnet and remove the two Torx screws holding the headlight in place, then lift the headlight forward and out of the car. Unplug ...

If your car came from the factory with halogen or HID bulbs, you’re going to need to replace them or upgrade them down the line. Both of these bulb types lose light output over time; thus, even if ...