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BMW Spare Key - How to Replace the Battery Sometimes, you only need to replace the battery in your BMW key fob. Fortunately, it's an easy fix. Find the keys you want to program, and a functioning key fob. In your car, with all doors and windows shut Then, insert the working key fob into the ignition, and turn it to position one. Keys stolen or lost A lost or stolen key is a frequent issue for a lot of drivers. Fortunately, there are ways to prevent this from happening. For instance, you could buy the new key from a dealership or locksmith. Yo