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How Much Does It Cost For Car Key Replacement? There are many options for those who lose their car keys. Locksmiths are the most affordable solution. However, the best way is to reach out to your dealer for a replacement if you have one. The dealer will charge a little more but the replacement is usually cheaper. Mechanical Losing your car key can be a stressful and costly experience particularly if you are using remote. Finding a replacement key could cost from $25 to $450, depending on the make and model of your vehicle.