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Replacing a Key Fob Modern cars are equipped with key fobs, which allow drivers to remotely start their car and open doors. They also have the ability to activate the alarm. These remotes look like advanced car keys with buttons, and they often conceal a switchblade or laser-cut keys within. Finding a replacement for your car's key typically requires visiting a dealership or an automotive locksmith, but you might have other options. Here are a few of them. Battery The key fob