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How to Add Change and Reprogram a Mazda 3 Spare Key Whether you dropped your key fob on the ground or it stopped working its best to have a spare key handy This article will tell you how to add alter and reprogramme your Mazda 3 keyfobs Warning Some keys require programming from a professional locksmith while others do not Use only authentic Mazda replacements to replace your key fob How to add a spare key If youre unable to get a spare key from the dealership when you purchase your Mazda 3 or accidentally break your current one Dont fret there is still an option to make another key Youll need to use a flathead screwdriver and a new CR2025 battery Once you have these items its time to access the key fob to change the battery First find the button that allows you to release the key The button is located beneath the metal portion Its easy to locate When you hit the button the cover should be removed immediately Then you can insert the head of the screwdriver into the notch or the spacing on the top of the metal piece and pry it off Insert your new or spare key into the slot after taking out the accessory key Set the ignition to ON and wait for about five seconds before turning it to OFF This will allow the system to recognize the new key and begin your vehicle in the future It is important to remember that you can only program up to three keys for your Mazda 3 The one thing you dont want is to have more than two functioning key fobs and not be in a position to get your vehicle started This is a safeguard to prevent unauthorized users from activating your key fobs and starting your car How to reprogram an unrepaired key Its a smart idea know how to reprogram a spare key in the event that your original key becomes lost or stolen This will prevent unauthorized people from starting your car or stealing it This will work with any Mazda You will require two keys that work for the reprogramming to begin If you dont have two functioning keys youll need bring your vehicle to the dealership to get it done Begin by stepping into your drivers seat and closing the door except for the one thats been opened Set the ignition to ON and insert the first functioning key mazda replacement keys before removing the key Repeat with the second key Once youve finished programming your new key youll have three working keys that you can use to start your car in the future Test each key to ensure sure that theyre working properly before throwing them away Its a good idea purchase a spare Mazda 3 key fob particularly if youre a driver who frequently loses their key or has other issues with it You can buy one online or in your local auto store Be sure to go through reviews prior to purchasing to ensure you dont buy one thats not compatible with your car How do you change the battery with a spare key Theres nothing worse than finding that the battery for your key fob has failed and you are unable to unlock your car Its a good thing that its simple to replace the battery and save some money at the dealership Press the auxiliary key button located at the back of the keyfob This will remove the key auxiliary and reveal two slots on the sides of the case Put the flathead screwdriver in one of these slots and then gently pry apart the two halves of the case After the battery is fully exposed remove the case and put it somewhere that you will not forget it Be sure to have an extra battery in place before you begin These batteries can be purchased from any store that sells batteries or from a Mazda dealer in Winter Garden The right type of battery is vital to ensure that your keyfob works correctly Replace the cap on the battery and then install the new battery Be careful not to damage the small rubber ring the battery rests on Finally press the two parts of the key fob together until you hear an audible click How to Reset the Keyless Entry System The key fob inside your Mazda 3 is not only an added convenience but its also an important security feature The car wont start if the key is stolen or lost even if youve got an extra key fob This is because the fob that you have to be reprogrammed by the dealership in order to function properly This could be a costly and frustrating experience Its a good idea to understand how to reset the system yourself To reset the system disconnect the battery for about 15 minutes This will eliminate any remaining electric current from the onboard computer Then disconnect the LF ECU and demand switch connectors Then verify the continuity between the following terminals To program a new key or a spare insert it into the slot and turn the ignition to ON Turn off the ignition after about five minutes The key information will now be transferred to your vehicles computer and the new fob will be able to start your vehicle in the future You can program up to three fobs however you should only use one at a time This will stop unauthorised people from copying your key and getting ahold of your vehicle You can buy a new keyfob online but it will still need to be cut and programmed by a dealer