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How to Replace the Key Battery of the Mazda 3

Model: Mazda 3 BK, MK 1 - Years 2003-2009
Part: Key

If you want to learn how to correctly replace the key battery of your Mazda 3 Mk1, simply read this guide carefully and follow the instructions. First, press the button located on the back of the cover to release the emergency key. Then, insert the tip of a flat screwdriver into the side slot and remove the top part of the cover. Next, repeat the same operation to open the cover and access the old battery. Replace it, and you are done.

Updated on 16 July 2026 by ScegliAuto

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