If you buy a new key when your old key gets faulty, you'll also need to program your ignition key. This is where a key fob programmer comes into play.

Programming a Single Key A handful of manufacturers will allow you to program a single key, even if you don’t have a key that works. Keep in mind that you’ll still need to have the key cut to fit the ...

If you're looking to pick up a new key fob, or repair one, you might wonder how long programming it takes and whether or not you can do it yourself.

Ford traced the problem to a computer program in the instrument cluster. Keys can be removed 30 minutes after the ignition switch is turned off if the cars are left in gear.

To verify your key in ignition switch is working. Open the driver’s door with the key inserted in the ignition and listen for the warning chime.

When the ignition key is turned, it rotates a plastic disc inside the ignition switch. A small metal part, called the detent plunger, slides into notches, or “detents,” in the plastic disc.