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How to Add Change and Reprogram a Mazda 3 Spare Key If youve dropped your key fob on the floor or it stopped working its always best to have a spare key handy This article will provide everything you must be aware of when the process of adding changing and changing the programming of your Mazda 3 key fobs A word of warning Certain keys require programming by a professional locksmith or dealer while other keys dont Use only authentic Mazda replacements to replace your key fob How to Add a Spare Key You can also add an additional key if you dont have a spare key available or if you accidentally damage your existing one Youll need the flathead screwdriver as well as a CR2025 new battery Once youve got the tools and are ready to open the key fob and change the battery First look for the key release button for the auxiliary key Its located under the metal component and is easy to find The back cover should come off the moment you press the button Then insert the head of the screwdriver into the notch or space on the top of the metal piece and pull it off After the auxiliary key has been removed insert your new or spare key into the slot Set the ignition to ON and wait about five seconds before setting it to OFF This will add the new keys information to the system that will allow it to start your vehicle in the future Its important to keep in mind that you can only program up to three keys on your Mazda 3 The most important thing is to have more than two working key fobs and not be in a position to get your car started new mazda key G28 Car Keys is a security measure to stop unauthorised users from activating your keys and starting your car How do I reprogram an unrepaired key Its smart to learn how you can reprogram a spare key in the event that your original key gets lost or stolen This will keep unauthorised persons from starting your car or stealing it This process is compatible with any Mazda but youll need two keys that work to begin the reprogramming If you dont have two functioning keys youll have to bring your car to the dealership to have it done Start by getting into the drivers seat and close all the doors except the one that is open Place the working key into the slot and then turn the ignition to ON Wait for five seconds then take the key out and repeat the process with a second key Once youve finished programming your new key youll have three keys that you can use to start your vehicle in the future Check each key to make sure theyre working correctly before taking them off Its a good idea to buy an extra Mazda 3 key fob especially if youre someone who often loses your key or has other issues with it You can buy one online or at your local auto store Make sure you go through reviews prior to purchasing so that you dont get the wrong key fob that isnt compatible with your car How to change the battery on a spare key Its awful to discover that the key fob you used to use has gone out and youre not able to unlock your vehicle Fortunately its easy to replace the battery and save yourself some money at the dealership The first step is to press the auxiliary button on the back of the key fob This will take out the key from the metal and reveal the slots on both sides of the case Press the flathead into one of these slots and then gently pry the two halves of the case apart Once the battery is fully exposed take it out of the case and put it in a spot where youll never forget it Be sure to bring a new battery ready before you start These batteries can be purchased from any store that sells batteries or from a Mazda dealer in Winter Garden Choosing the correct battery will ensure that your key fob operates correctly Replace the battery cap and then install the new battery Be careful not damage the rubber ring on which the battery rests Finally press the two parts of the key fob together until you hear a click How to Reset the Keyless Entry System The Mazda 3 key fob is not just a piece of equipment for convenience Its also a security measure The car wont start if the key is stolen or lost even if you have a spare key fob The key fob needs to be reset by the dealer to allow it to work again It can be a stressful and costly process Therefore its advisable to understand how you can reset the system Remove the battery from the system for 15 minutes This will erase any residual electricity from the onboard computer Then disconnect both the connectors for the LFECU and the demand switch connectors After that test for continuity between the following terminals To program a new key or a spare insert it into the slot and set the ignition to ON Put the key in for around five seconds and then switch off The keys information has been transferred to the computer of your vehicle and the new fob is able to start your car You can program as many fobs as you want but only one can be in use at any particular time This prevents unauthorized people from copying your key and gaining access to your car You can purchase a new keyfob from the internet however it must be cut and programmed by a dealer
