Your key fob contains a hidden mechanical key blade that unlocks your car when the battery dies, plus backup engine start procedures.

These modern key fobs add conveniences, but replacing them if they get lost or broken can be expensive. To better understand the steps needed to replace a key fob—and the costs—we set out to buy and .

Long gone are the days of having to use an actual key to unlock your car doors. Modern vehicles typically come with a remote key fob — a term with an interesting backstory — allowing you to lock and ...