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The Benefits of Having a Spare Key For Cars If you buy a new car, the dealer will typically give you two keys. One will become your primary key, while the other will be your spare key. You can hide your spare key in dryer vents or power meter boxes. Be sure they're not accessible and cannot be altered. Peace of Mind The primary benefit of having a spare key is that it offers peace of mind. This is due to the potential stress of getting locked out of your car. It also lets you easily and quickly access your vehicle in the event that you acciden