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Can You Program Your Own Car Keys? Only a few vehicles available allow you to program your own keys. However, is extremely risky and could cause damage to the computer of your car. The transponder chip in the key creates a digital signature. The car's database of these signatures and then matches them to start the car. How to program a Keyless Entry System A key fob allows you to lock and unlock your vehicle without using the traditional key. It transmits radio signals to the vehicle, which a