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How to Add Change and Reprogram a Mazda 3 Spare Key If youve dropped your key fob on the ground or it has stopped working its a good idea to have a spare key on hand This article will tell you how to add change or reprogramme your Mazda 3 keyfobs Warning Some keys require programming from a professional locksmith while others do not Make sure you only use official Mazda replacements for your key fob How to Add a Spare Key If youre not fortunate enough to get a spare key from the dealer when you purchase your Mazda 3 or accidentally break your current one dont worry theres an option to make another key To do this youll need an incredibly small screwdriver a flathead screwdriver and an updated CR2025 battery Once youve got the tools you can remove the key fob to change the battery First locate the auxiliary key release button The button is on the underside of the metal part Its easy to find Once you press the button the cover should be removed immediately Then insert the screwdriver head into the notch on top or in the space and pull the metal piece off Insert your new or spare key into the slot after you have removed the secondary key Turn on the ignition and wait for approximately five seconds and then turn it to off This will register the new keys information into the system that will allow it to start your vehicle in the future It is only possible to program three keys in your Mazda 3 You dont want to use more than two key fobs in order to start your car This is a precautionary measure to stop unauthorized users from activating your keys and then starting your vehicle How to reprogram a spare key If you have a spare key its a good idea to know how to program it if the original key you had is stolen or lost This will stop unauthorized persons from abusing your vehicle and restarting it This should work with any Mazda Youll require two keys that are functioning to start the reprogramming process If you dont own two working keys youll need bring your car to the dealership to complete the process Begin by stepping into your drivers seat and closing the door except for the one thats opened Turn the ignition on and insert the initial working key After replace mazda key take the key out and repeat with the second key After you finish programming your new key you should have three keys that be able to start your vehicle in the future Before storing each key make sure that its working correctly Its a good idea buy a spare Mazda 3 key fob especially if youre a driver who often loses your key or has other issues with it You can buy one online or in your local auto store Make sure to go through reviews prior to purchasing to ensure that you dont purchase the wrong key fob that isnt compatible with your car How do I change the battery on a Spare Key Theres nothing more frustrating than finding that the battery in your key fob has failed and you are unable to unlock your vehicle Its easy to change the battery yourself and save money at the dealer Press the auxiliary key button on the back of the keyfob This will remove the key that is used as an auxiliary key and expose two slots on the sides of the case Use the screwdrivers flathead to push it into one of these slots Then gently remove the two parts of the case When the battery is completely exposed remove it and place it in a safe place in a place where you will not forget it Make sure you have a replacement battery before you begin They can be found at any store that sells batteries or at a Mazda dealer near Winter Garden Choosing the correct battery will ensure that your key fob is working effectively Then put the new battery into place and replace the cap on the battery Be careful not to damage the small rubber ring that the battery sits on Then press the two halves of the key fob together until you hear an audible click How do I reset a Keyless Entry System The key fob on your Mazda 3 is not only an added convenience but its also an important security feature The car wont start if your key is lost or stolen even if youve got an extra key fob The key fob needs to be reprogrammed by the dealer to enable it to function again It can be a frustrating and costly ordeal So its best to learn how you can reset the system To reset the system remove the battery for around 15 minutes This will remove any residual electricity in the onboard computer Then disconnect the LFECU and demand switch connectors Check continuity between the following terminals Insert the key into the slot then switch on the ignition 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 start your car in the future You can program up to three fobs but you should only use one at each time This will prevent unauthorised people from stealing your key and gaining access to your vehicle You can purchase a brand new keyfob online however itll still need to be programmed and cut by an authorized dealer