How to Program a Car Key Modern cars have more than just a key to start the engine. They also have a remote that can lock and unlock doors. Key fobs need to be programmed in order to work. Some keys for cars can be preprogrammed by the owner themselves https://carlocksmith37455.shotblogs.com/learn-the-car-key-programing-tricks-the-celebs-are-making-use-of-43354400