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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 locksmiths or assistance on the road when you lose keys. A basic mechanical key may be replaced at the hardware store by a locksmith, or at a dealership. But a transponder key or smart key will require the dealership to connect it to your car's immobilizer. Cost There are ways to minimize expenses if you lose the keys to your car. Find an auto locksmith that specialises in your vehicle.