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How to Replace the Key Fob Battery for the BMW 3 Series?

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

As seen in this tutorial, replacing the key fob battery for the BMW 3 Series is a very simple and quick task. You will need a replacement CR2032 battery and, if necessary, a small flathead screwdriver. First, extract the emergency key by pressing the designated button, then use the key itself or the screwdriver to unlock the rear cover by prying at the indicated slot. Once done, remove the old battery, insert the replacement in the correct orientation, and reassemble everything.

Updated on 29 June 2026 by ScegliAuto

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