BMW Spare Key - How to Replace the Battery <img width="371" src="https://g28carkeys.co.uk/wp-content/uploads/2023/10/Citroen.png"> Sometimes, you only need to replace the battery in your BMW key fob. It's a simple fix. Take the keys you wish to program, along with an active key fob. Insert the key fob into the ignition, with the windows and doors closed. K
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