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Car Key Replacements Whether it's a simple lock-and-key keys or a sophisticated fob key, losing it could cost you big time. It's best to keep an extra key in your wallet. If you do lose a key, the cheapest solution is to hire an auto locksmith. A dealership may be more expensive, but it's an option worth considering. Mechanical Keys The keys to your car are likely to be mechanical if you own an older vehicle that does not use key fobs. Keys of this type are made of metal, like brass, steel or a