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How to Replace the Key Battery on a Mazda 3

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

After several years of use, it may happen that the key for your 2019 Mazda 3 no longer works due to a completely dead battery. Fortunately, replacing the battery is a very simple task, and below we will discover the various steps to follow. First, take the key and remove the rear cover. Next, do the same with the front cover and remove the battery holder. Once done, simply replace the dead battery with a new one. Reassemble the key covers and you are finished.

Updated on 27 July 2026 by ScegliAuto

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