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Keep an Extra Car Key With You in Case You Lose Yours A spare car key is a good idea. Keep it in a secure location to avoid having to call roadside assistance or locksmiths when you lose keys. A mechanical key that is basic can be changed by a hardware store or a locksmith the dealership. A transponder or smart key however, needs to be paired with your vehicle's immobilizer through the dealership. Cost Losing your car keys isn't an enjoyable experience, but there are ways to minimize the cost. Find an auto locksmith wh