Pull out the dead key fob battery from the mazda keyless remote.
2012 mazda 3 key fob battery.
Push on ignition key.
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Mazda 3 key fob battery remote replacement diy years 2004 2018 the mazda 3 also known as the mazda axela is a fun to drive reliable and safe compact car.
Released in 2004 the vehicle is currently in its fourth generation.
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Remove the key fob battery cover from your mazda remote.
Place the back mazda key fob case aside.
Push the metal ignition key piece back in to the fob until it clicks in to place.
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Fold the metal ignition key back down in to the fob and double check that the parts are secure.
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The positive is on top while the negative side of the button cell battery is facing the key fob.
Make sure the positive symbol is facing you.
Modify 2012 mazda 3 remote to use a bigger battery replacing cr 1620 with cr 1632.
Test new fob battery.