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How to Replace a Lost Car Key Losing your car keys can be a major trouble. Most of the time, the best option is calling your local locksmith or dealer. To make a replacement key, they'll require proof of ownership along with the old one. However, this isn't always the most economical method to take. Traditional Keys Car keys made of metal were the most commonly used. They have grooves that fit into slots in the ignition. The key is then placed into the ignition and turned to start the car. If you l