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Car Key Programming Car key programming is a crucial step in ensuring that the replacement key fob you purchase will work with your car. Without this the key will not engage the ignition cylinder, but will not start the engine, or open the doors. You can quickly and easily program your new keys with a locksmith who has the right equipment. Find out more about this procedure and the importance of it. Self-Programming In the decades leading up to the 21st Century car key technology began to evolve away from mechanical keys to a hybrid of electronic and physical protoco