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Can You Program Your Own Car Keys? Only a few vehicles that are available allow you to program keys by yourself. However, doing this is very risky and can cause damage to the computer of your car. The transponder chip on the key creates digital signatures. The car's memory holds these signatures and matches them to allow the car to start. How do you program Keyless Entry Systems? With a key fob, you can lock and unlock your vehicle without using the traditional car keys. It transmits radio waves to the vehicle, that activate the locking system onboa