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Replacing BMW Key Fob Batteries You have pressed the BMW key fob button and nothing took place. If so, you may need to replace the battery. You can buy an empty replacement key and fob through an online retailer however, you'll have to bring the key to a dealership or locksmith to get it programmed to your vehicle. You'll need proof of ownership such as a photocopy of your ID or registration. Rekeying If your BMW key fob isn't operating properly, the first thing you have to do is get an upgrade to the b