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How to Replace the Key Battery of the Mazda 3

Model: Mazda 3 MK 3, BN, BM - Years 2013-2019
Part: Key

If the smart key of your Mazda 3 (2013-2019) is no longer working due to a completely dead battery, don't worry. With the following guide, you will be able to replace it yourself in just a few seconds. First, remove the emergency key and take off the rear cover. Once done, locate the battery holder and also remove its cap. Finally, replace the old button battery with a new one and correctly reassemble the various components you previously removed. Now, test the proper functioning of your key.

Updated on 29 July 2026 by ScegliAuto

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