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How to Add, Change, and Reprogram a Mazda 3 Spare Key If you've dropped your key fob on the floor or it stopped working, it's a good idea to have a spare key on hand. This article will explain everything you should be aware of when changing, adding, and programming your Mazda 3 key fobs. A word of caution Some keys require programming by a professional locksmith or dealer, whereas other keys do not. Be sure to only use genuine Mazda replacements for your key fob. How do I add a spare key? If you're not lucky enough to find a spare key from the dealer when you purchase your Mazda 3 or accidentally break your current key do not fret — there's still a way to add another key. You'll need to use a flathead screwdriver, and a new CR2025 battery. Once you've got these items, it's time to open up the key fob and swap the battery. First find the button that allows you to release the key. It's located under the metal component and is easy to locate. The back cover should slide off as soon as you press the button. Next, place the screwdriver's head into the notch or the space at the top of the metal component and pry it 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 turning it to off. This will add the new information on the key to the system that will allow it to start your car in the future. It's important to know that you can only program up to three keys on your Mazda 3. The final thing you want is to have more than two functioning key fobs but not be able to get your car started. This is a precautionary measure to stop unauthorized users from activating your keys and launching your car. How to Reprogram a Spare Key If you have a spare key, it's important to know how to program it if your original key is stolen or lost. This will keep unauthorized people from abusing your vehicle and re-starting it. This procedure should work with any Mazda however, you'll require two working keys to begin the process of reprogramming. If you don't have two keys that work, it's best to take your Mazda to the dealer to have this done. Begin by putting yourself in the driver's seat and shutting the door, excluding for the one that's been opened. Set the ignition to ON and insert the first working key. Wait five seconds before removing the key. Repeat with the second key. After you finish programming your new key, you should have three keys that work to start your car in the near future. Before saving each key, be sure it's working properly. It's a good idea buy a spare Mazda 3 key fob, especially if your car is one who frequently loses their key or has other issues with it. You can purchase one on the internet or at your local auto store. Be sure to look up reviews before you purchase to ensure you don't buy a key fob which isn't compatible with your car. How to Change the Battery on a spare key It's awful to discover that your key fob has failed, and you are not able to unlock your vehicle. It's easy to change the battery yourself and save money at the dealership. Press the auxiliary button on the back of the keyfob. This will remove the auxiliary key and expose an opening on both sides of the case. The flathead should be inserted into one of these slots and then gently push the two halves apart. When the battery is completely exposed, remove it and place the case somewhere safe from being lost. Be sure to have a new battery ready before you start. They can be bought at any store selling batteries or from a Mazda dealer in Winter Garden. The correct type of battery is vital to make sure that your keyfob functions properly. Replace the cap on the battery and then install the new battery. Be careful not to scratch the small rubber ring the battery sits on. Finally press the two parts of the key fob together until you hear the sound of clicking. How do g28carkeys.co.uk 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. The car will not start if the key is stolen or lost, even if you've got a spare key fob. This is because the key fob has to be reprogrammed at the dealership in order to work again. It's a difficult and costly experience. Therefore, it's recommended to know how to reset the system. To reset the system, disconnect the battery for about 15 minutes. This will erase any residual electricity from the onboard computer. Then, disconnect the connectors for the LF-ECU 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 turn the ignition to ON. Put the key in for around five seconds, and then turn off. The key's information will be transferred to your vehicle's computer and the new fob will be able start your vehicle in the future. You can program up to three fobs but you should only use one at each time. This will keep unauthorised individuals from stealing your keys and getting access to your vehicle. You can purchase a new key fob on the internet, but you'll still need to visit an authorized locksmith or dealer to cut it and get it programmed.