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Replacing BMW Key Fob Batteries Have you ever pressed your BMW key fob unlock button and nothing occurred? It is possible to replace the battery if this is the situation. You can order an blank replacement key from an online retailer. However, you will need to take the key to a dealer or locksmith to be programmed for your vehicle. You will need to provide proof of ownership such as the photocopy of your ID or registration. Rekeying You should replace the battery if your BMW key fob isn't work