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Replacing a Key Fob Modern cars come with key fobs, which allow drivers to remotely start their car and open the doors. They can also set off the alarm. These remotes resemble advanced car keys, with buttons, and often conceal a switchblade or laser-cut key inside. Finding a replacement for your car's key is usually a matter of visiting a dealership or an auto locksmith, but you may have other options as well. Here are some of them. Battery The key fob is used to control the security systems o