Replace the battery cap.
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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.
Push the metal ignition key piece back in to the fob until it clicks in to place.
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.
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Stand near your mazda3 and press the lock or unlock buttons to test the new key fob battery.
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Remove the key fob battery cover from your mazda remote.
Fold the metal ignition key back down in to the fob and double check that the parts are secure.
The positive is on top while the negative side of the button cell battery is facing the key fob.
Place the back mazda key fob case aside.
Insert the new battery.
To open a mazda key fob press the small button located on the back under the silver key ring.
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Lastly reinsert the auxiliary key.
All you need is a small flat head or pocket screwdriver a replacement battery from your local.
Replace the key fob cover which should snap into place.
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Test new fob battery.
Pull out the dead key fob battery from the mazda keyless remote.
Push on ignition key.
If your mazda key fob is not working properly chances are you need to replace the battery in your key fob.
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