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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea always to keep a spare key on hand regardless of whether you lost your keyfob, or it was unable to function. This article will provide everything you must learn about changing, adding, and changing your Mazda 3 key fobs. A word of caution Some keys require programming by a locksmith professional or dealer, while other keys don't. Only use official Mazda replacements to replace your key fob. How do I add a spare key If you're not lucky enough to receive a spare key from the dealer when you buy your Mazda 3 or accidentally break your current key, don't worry — there's still the option of adding another key. To do this, you'll need an inexpensive flathead screwdriver as well as a new CR2025 battery. Once you've got the tools 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 part. It's easy to locate. The cover that covers the back should come off as soon as you press the button. Then, place the screwdriver's head in the notch at the top or in the space, and remove the metal part. Once mazda demio key is removed, insert your new or spare key into the slot. Turn on the ignition and then wait for around five seconds, and then turn it to OFF. This will allow the system to recognize the new key and begin your vehicle in the future. It's important to note 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 measure designed to prevent unauthorised users, like valet drivers who are not authorized to use your key and thereby starting your car. How to reprogram an unrepaired key It's a smart idea be aware of how to reprogram a spare key in the event that your original key is lost or stolen. This will stop unauthorised people from getting into your car and causing damage to it. This process is compatible with any Mazda however you'll need two working keys to start the reprogramming. If you don't have the two working keys, you'll need bring your car to the dealer to get it done. Start by stepping into driver's position and shutting all doors, with the exception of the one that is open. Place the working key in the slot, then set the ignition to the ON position. Wait for five seconds, then remove the key and repeat the procedure with the second working key. After you've programmed your new key, you'll have three keys that start your car in the future. Check each key to make sure that they're working properly before placing them away. You should think about purchasing an extra Mazda 3 remote, especially if your car is prone to problems. You can purchase one on the internet or at a local automotive store. Make sure to review the reviews before buying to ensure that you don't get one that's not compatible with your vehicle. How do I change the battery on a spare key It's very frustrating to discover that your key fob is dead and you're locked out of your vehicle. Fortunately, it's easy to replace the battery and save yourself some money at the dealer. The first step is to press the auxiliary key button that is located on the back of the key fob. This will remove the metal key that is used as an auxiliary key, and expose a slot on both sides of the case. Press the flathead screwdriver into one of these slots, and gently take apart the two halves of the case. After the battery is fully exposed, take it out of the case and place it somewhere you will not forget it. Be sure to bring a replacement battery prior to starting. You can purchase them at any store that sells batteries or at an Mazda dealer close to Winter Garden. Using the right type of battery will ensure that your key fob functions perfectly. Then, put the new battery into place and replace the cap of the battery. Be careful not to scratch the rubber ring on which the battery rests. The two halves should be pressed together until you hear the click. How do I reset a Keyless Entry System The Mazda 3 key fob is not just a piece of equipment for convenience. It's also an element of security. The car will not start if your key is lost or stolen even if you have a spare fob. The key fob has to be reset by the dealer to enable it to function again. It can be a costly and frustrating experience therefore it's a great idea to know how to reset the system yourself. To reset the system, disconnect the battery for about 15 minutes. This will eliminate any residual electrical current from the computer on board. Then, disconnect the 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 turn the ignition to ON. The key should remain in the ignition for around five seconds, and then turn off. The key's details are now transferred to the computer of your vehicle and the new fob can start your vehicle. You can program up to three fobs however, you should only use one at one time. This prevents unauthorized people from copying the key and gaining access to your vehicle. You can buy a new key fob online, however you'll still need to visit an authorized locksmith or dealer to have it cut and programmed.