Some modern key fobs still require a key blade to activate the ignition switch, even if the vehicle doors are unlocked by remote control. These blades are strong and rarely break or bend, but with constant usage, the blade may become loose from the fob, preventing it from fitting closely into the ignition opening. This is particularly commonplace in more recent models of car, in which the key blades are less central to the design or are intended solely as an emergency backup, whereas older keys tended to be more robustly built.
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