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Why You Should Have Spare Car Keys Cut Many modern cars have programmable keys, which can be used to modify the settings of the car. For instance, you can change the speed at which the car drives or the volume of the radio. You can still personalize your car even if it has a spare cut. However, you will have to program the new key each time you drive it by someone else. Cost It is a small but a worthwhile investment to save yourself the stress and expense of losing your only set of keys.