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How to Replace the Key Fob Battery of a BMW 3 Series F31

Model: BMW Serie 3 F30, F31 - Years 2012-2019
Part: Key

In this guide, you will see how to replace the key fob battery of a BMW 3 Series F31. The first step is to pull the key out of the fob, as shown at 0:20. Now, using a screwdriver, pry open the slot where you extracted the key; this will allow you to remove the plastic cover that protects the battery. Use the screwdriver again to extract the battery from its housing; replace it with a new CR2450 battery. Insert it with the positive side facing you. Now simply close the plastic cover and reinsert the key.

Updated on 4 May 2026 by ScegliAuto

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