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Keep an Extra Car Key With You in Case You Lose Yours It's a good idea to keep an extra key for your car. Keep it in a secure place to avoid having to call locksmiths or assistance on the road when you lose your keys. A mechanical key can be replaced at an hardware store by a locksmith or a dealership. A transponder or smart key, however, will need to be linked to your vehicle's immobilizer through the dealership. Cost Losing your car keys is not an enjoyable experience, however t