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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea to have an extra key on hand no matter if you've dropped your keyfob or it was unable to function. This article will explain everything you need to be aware of when changing, adding, and changing your Mazda 3 key fobs. A word of warning Certain keys need to be programmed by a locksmith professional or dealer, whereas others don't. Make sure to use official Mazda replacements for your key fob. How to add a spare key If you're unable to receive a spare keys from the dealership when you purchase your Mazda 3 or accidentally break the one you have, don't worry — there's an option to make another key. To accomplish this, you'll need an incredibly small screwdriver, a flathead screwdriver, and an updated CR2025 battery. Once you've got all the equipment and tools, you're ready to open the key fob. First look for the auxiliary key release button. It's located on the bottom of the metal portion. It's easy to find. When you hit the button, the cover will fall off instantly. Then, you can insert the screwdriver head into the notch on top or the space, and pull the metal piece off. Insert your spare or new key into the slot after removing the auxiliary key. Turn on the ignition and wait for approximately five seconds, and then turn it to off. This will allow the system to recognize the new key and start your vehicle in the future. It is important to remember that you can only program up to three keys on your Mazda 3. You don't want to have to use more than two key fobs in order to start your vehicle. This is a safety precaution designed to prevent unauthorized users, such as valet drivers who are not authorized to use your key and thereby starting your car. How to reprogram a spare key? It's smart to know how you can reprogram a spare key in the event that the original key is lost or stolen. This will stop unauthorised people from starting your car or taking it. This process is compatible with any Mazda but you'll need two keys that work to begin the reprogramming. If you don't own two working keys then it's best to bring your vehicle to a dealer to get this done. Start by getting into the driver's seat, closing all the doors except the one that is open. Place the working key into the slot, and then turn the ignition to ON. After five seconds, take the key out and repeat the procedure with the second working key. After you finish programming your new key you should have three keys that work to start your car in the near future. Test each key to be sure that they're working properly before throwing them away. You should think about purchasing a spare Mazda 3 remote, especially when your car is susceptible to problems. It's possible to find one on the internet or at a local automotive store, but be sure to read reviews before buying so you aren't purchasing an item that isn't compatible with your car. How do you change the battery on a spare key There's nothing more frustrating than finding that the battery in your key fob has gone out and you're not able to unlock your car. It's easy to change the battery yourself and save money at the dealership. Press G28 at the back of the keyfob. This will release the metal key auxiliary and reveal a slot on both sides of the case. Place the flathead in one of these slots and then gently pry the two halves apart. Once the battery is fully exposed, remove it and place the case in a place where you will not forget it. Make sure you have a new battery ready before you start. They can be found in any store that sells batteries or at a Mazda dealer close to Winter Garden. The correct battery is crucial to make sure that your keyfob functions correctly. Replace the cap on the battery and then insert the new battery. Be careful not damage the rubber ring that holds the battery. The two halves should be pressed together until you can hear the click. How to Reset a Keyless Entry System The Mazda 3 key fob is not just a convenient feature. It also serves as an element of security. The car will not start if your key is lost or stolen, even if you've got an extra fob. This is because the key fob has to be reset at the dealership to work properly. It can be a stressful and expensive ordeal. Therefore, it's best to know how to reset the system. Disconnect the battery from the system for 15 minutes. This will erase any residual electrical current from the computer on board. Then, disconnect both the LF-ECU connector as well as the demand switch connectors. After that, test for continuity between the following terminals: Insert the key into the slot, then switch on the ignition. The key should remain in the ignition for about five seconds, then switch it off. The key information will now be added to the vehicle's computer and the new fob will be able start your car in the future. You can program any number of fobs you desire, but only one should be used at a particular time. This prevents unauthorized people from copying the key and getting ahold of your vehicle. You can purchase a new keyfob online, however it'll still need to be cut and programmed by a dealer.