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How to Replace the Key Fob Battery on a BMW 3 Series?

Model: BMW Serie 3 E91, E90, E92 - Years 2005-2013
Part: Key

Replacing the battery in the key fob of a BMW 3 Series is an extremely simple and cost-effective task; let's see how to proceed in this tutorial. For this, you will need a replacement CR2032 battery and a small flathead screwdriver. First, press the button on the back and pull out the emergency metal key, then pry open the cover using the screwdriver in the indicated slot. At this point, you can remove the old battery and insert the new one, ensuring the correct orientation with the positive side facing you.

Updated on 13 June 2026 by ScegliAuto

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