If the battery in your car key fob has died, here's how to replace it – including the type of battery you'll need and the cost involved.

Like anything powered by a battery, a car key fob can die—often at the worst time. Here’s how to change the battery in your key fob quickly and safely.

The key fob is your lifeline to your car, letting you unlock the doors and set off the alarm, at a minimum, but how can you tell if it needs a new battery?

Several car manufacturers require the use of special scan tools to reprogram their key fobs. Some license those tools out to locksmiths and auto repair shops.

A woman with an electronic car key fob© F.j. Jimenez/Getty Images A person trying to reprogram a key© Aleksandr Potashev/Getty Images A person reprogramming car keys© Potashev Aleksandr ...

Electronic keys introduce new components that can be expensive, even without paying a dealer to program them. If you can do the job yourself, you can save both time and money by not having to visit ...