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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 regardless of whether you lost your keyfob or it has stopped working. This article will explain how to add, alter or reprogramme the Mazda 3 keyfobs. Certain keys require programming by an experienced locksmith, whereas others don't. Only use authentic Mazda replacements to replace your key fob. How to add a spare key You can add an additional key if you don't have a spare key or when you accidentally damage the one you already have. You'll need an flat-head screwdriver and a CR2025 new battery. Once you've got all the equipment and tools, you're ready to open the key fob. Locate the key release auxiliary. It's located underneath the metal portion and is easy to locate. When you press the button, the cover will fall off instantly. Then, put the screwdriver head into the notch on top or the space and pull the metal piece off. Insert your spare key or a new one into the slot after taking out the secondary key. Set the ignition to ON and wait for five seconds before setting it to OFF. This will allow the system to recognize the new key and begin your vehicle in the future. You can only program three keys to your Mazda 3. The most important thing is to have more than two working key fobs but not be capable of getting your vehicle started. This is a security precaution designed to stop unauthorized users, such as valet drivers who are not authorized to use your key and starting your vehicle. How to reprogram an unrepaired key? If you have a spare key, it's a good idea to be aware of how to program it in the event your original key gets stolen or lost. This will prevent unauthorized people from starting your vehicle or taking it. This process is compatible with any Mazda however you'll need two working keys to start the reprogramming process. If you don't have two functioning keys, you'll have to bring your car to the dealership to complete the process. Begin by getting in your driver's seat and close the door, with the exception for the one that's been opened. Insert the first working key into the slot, then set the ignition to the ON position. After five seconds, remove the key and repeat the process with the second working key. After you've programmed your new key, you should have three keys that work to start your car in the near future. Before you store each key, make sure it's working properly. You should consider buying an extra Mazda 3 remote, especially if your car is prone to problems. You can purchase one online or at a local automotive store. Be sure to review the reviews before buying to ensure that you don't purchase one that's not compatible with your car. How do you change the battery on a spare key? It's very frustrating to discover that your key fob is dead, and you are locked out of your vehicle. It's a good thing that it's simple to replace the battery and save some money at the dealer. The first step is to press the auxiliary button on the back of the key fob. This will remove the metal key and reveal the slots on both sides of the case. Press the flathead screwdriver into one of these slots, and gently remove the two parts of the case. Once mazda rx8 key G28 Car Keys has been fully exposed, remove the case and place it somewhere that you will not forget about it. Before you start, make sure that you have a new replacement battery. They are available in any store that sells batteries or at a Mazda dealer close to Winter Garden. Choosing the correct battery will ensure that your key fob operates effectively. Then, place the new battery in the correct place and replace the cap of the battery. Be careful not damage the rubber ring that holds the battery. Finally, press the two halves of the key fob until you hear the sound of clicking. How can I reset the Keyless Entry System The key fob that you have in your Mazda 3 is not only a convenience, it's also an important security feature. If you lose your key, or have it stolen the car won't start even if it has the spare key fob. The key fob needs to be reprogrammed by the dealer to make it work again. It can be a stressful and costly process. Therefore, it's advisable to understand how you can reset the system. Disconnect the battery from the system for 15 minutes. This will eliminate any residual power from the on-board computer. Then, disconnect both LF-ECU and demand switch connectors. Then, check continuity between the following terminals: To program a new key or a spare, place it in the slot and set the ignition to ON. Put the key in for about five seconds, then turn it off. The key's details will be added to the vehicle's computer, and the new fob will be able start your vehicle in the future. You can program as many fobs as need but only one can be used at a specific time. This stops unauthorized individuals from copying the key and gaining access to your car. You can purchase a replacement keyfob on the internet, but it must be programmed and cut by an authorized dealer.