If your low beam headlights have failed, there are a few things you can do to try and fix the problem. First, check the fuse box under the hood and see if the fuse for the low beams has blown. If it has, replace it with a new fuse and see if that fixes the problem. If not, then you'll likely need to replace the headlight bulbs themselves. To do this, first disconnect the battery so you don't accidentally short circuit anything. Then, remove the headlight assembly from the car - there will be screws holding it in place. Once you have access to the bulbs, twist them counterclockwise to remove them from their sockets. Insert new bulbs into the sockets and screw them in clockwise until they're tight. Put everything back together and reconnect the battery, and your low beams should now be working again!