This is known as the "immobilizer" system. If it does not recognize this code, your car will not start. When you insert the key into the ignition switch, your car reads this code and allows your car to start. Your car must be programmed to recognize this code. Modern cars have a small transponder chip inside the plastic head of the key that contains a "code". We try to indicate in our listings whether your car can be programmed yourself and whether programming instructions are included or not. On these cars you cannot program them yourself. They have to use diagnostic equipment and hook up to your car's computer. Some makes and models can only be programmed by taking it to a dealer or a qualified technician.
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