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How to Program a Car Key Modern cars come with more than a key that can start the engine. They also come with a remote that can lock or unlock doors. Key fobs must be programmed to work properly. Certain keys for cars can be preprogrammed by the owner himself, but it is recommended to consult an expert. This will prevent any possible damage to the car's computer system and ensure that the new key is working correctly. How to program a key Before the turn of the 21st century the majority of cars utilized basic key systems