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How to Reprogram Car Keys You'll typically require a spare key that works and a programming device. You should also keep your owner's manual of your car available. The procedure for reprogramming will differ according to the model of car. Begin by putting your working key in the ignition, then turn the ignition to the "on" position. This will inform the system that it's time to enter programming mode. Getting an entirely new key It can be a hassle to get into your car after you've lost the keys. There are a few simple steps