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How to Reprogram Car Keys You will typically need an extra key that functions and a programming device. Also, it is recommended to have the owner's manual of your vehicle in hand. The procedure for reprogramming will differ according to the car model. Start by inserting your working key into the ignition and then turning the ignition to the "on" position. This will prompt the system to enter programming mode. Finding an entirely new key It can be frustrating trying to get in your car after you've los