How to replace a key fob battery on a car.

The key was reset when the battery was replaced, so it will need to be reprogrammed.This is why the key is not working.You will need to reprogram the remote after you replace the battery.

How do you reset a key?Before starting the car, you should put your key into the ignition and turn it to "On" position.For one second, press and hold the "Lock" button on your remote car starter.The car lights should turn off if you turn your key into the "Off" position.

If the batteries go dead over time, it's a good idea to replace the battery.Check the buttons and contacts for broken ones.You can reprogram your remote yourself or have a professional do it.

Turn your car's engine off and then put the key in the "run" position.Press and hold the "unlock" button.Release the buttons at the same time.