Remove the key fob battery cover from your mazda remote.
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Replace the battery cap.
The positive is on top while the negative side of the button cell battery is facing the key fob.
Stand near your mazda3 and press the lock or unlock buttons to test the new key fob battery.
Make sure the positive symbol is facing you.
Test new fob battery.
Lastly reinsert the auxiliary key.
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To open a mazda key fob press the small button located on the back under the silver key ring.
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Push on ignition key.
Fold the metal ignition key back down in to the fob and double check that the parts are secure.
Replace the key fob cover which should snap into place.
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What to do if you lose your car keys again though you can try figuring out how to replace the mazda key fob battery yourself we always recommend working with a qualified mazda technician to avoid damaging the key.
This will allow you to pull the manual accessory key out and access the fob panel inside to change the battery or clean as needed.
Push the metal ignition key piece back in to the fob until it clicks in to place.
Insert the new battery.
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Place the back mazda key fob case aside.