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What Is Car Key Programming? Modern car keys are more than just simple pieces of metal. They contain a computer chip in them that communicates with your car. This is vital to keep your vehicle safe and prevent unauthorized use. However, you must programme your keys prior to them being able to use your vehicle. This should be left to the professionals. Security Transponder chips are used to unlock and start modern vehicles instead of the older metal keys. This makes it difficult to copy a programmed car key and only allows authorized vehicles to start their engine