Car key programming is the act of synchronizing a key’s internal chip to a vehicle’s onboard computer. The car’s immobilizer recognizes the key and permits the engine to start. If that step is never done then a brand new cut key that looks perfect and turns the ignition just fine will still leave you stranded. The metal blade opens the door, but it's the chip that tells the car "This one is allowed to drive away." Many people do not think about this till they are upright in a