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How to Add, Change, and Reprogram a Mazda 3 Spare Key If you've dropped your key fob on the ground or it stopped working, it's always a good idea to have an extra key in your pocket. This article will tell you how to add, modify and re-programme your Mazda 3 keyfobs. A word of caution: some keys require programming by a professional locksmith or dealer, while other keys do not. Make sure you only use official Mazda replacements for your key fob. How to Add a Spare Key You can add an additional key if you don't have a spare key or in the event that you break your current one. To do this, you'll need an inexpensive flathead screwdriver as well as an CR2025 battery that's new. Once you've got these items, it's time to remove the key fob and replace the battery. Locate the auxiliary key release. The button is located on the underside of the metal portion. It's easy to find. The back cover should come off when you press the button. Then, you can insert the screwdriver's head into the notch or space on the top of the metal component and then pull it off. After the auxiliary key has been removed, insert the new or spare key into the slot. Set the ignition ON and wait for about five seconds, 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 know that you can only program up to three keys for your Mazda 3. You don't want to have to use more than two key fobs in order to start your car. This is a precautionary measure to prevent unauthorized users from activating your key fobs and starting your vehicle. How to reprogram a spare key It's a smart idea to be aware of how to reprogram an extra key in the event that your original key is lost or stolen. This will stop unauthorized persons from opening your car or stealing it. This procedure should work with any Mazda however you'll need two working keys to begin the reprogramming process. If you don't own two working keys, you'll need to bring your vehicle to the dealership to have it done. Begin by stepping into your driver's seat and close the door, except for the one that's been opened. Turn the ignition on and then insert the first working key. Wait five seconds before removing the key. Repeat with the second key. After programming your new key you should have 3 keys that will allow you to start your vehicle in the future. Before you store each key, make sure that it's working correctly. It's a good idea purchase an extra Mazda 3 key fob, particularly if you're a driver who has a tendency to lose their keys or has other issues with it. You can purchase one online or at a local automotive store. Make sure you go through reviews prior to purchasing to ensure that you don't purchase one that's not compatible with your vehicle. How to change the battery with a spare key? It's a nightmare to discover that the key fob you used to use has gone out and you're locked out of your car. It's easy to replace the battery yourself and save money at the dealership. Press the auxiliary button on the back of the keyfob. This will remove the metal key and reveal the slots on both sides of the case. Place the flathead in one of these slots, and then gently push the two halves of the case apart. Once the battery has been fully exposed, take it out of the case and place it somewhere that you will not forget it. Be sure to bring an extra battery in place before you start. You can purchase them at any store that stocks batteries or at an Mazda dealer near Winter Garden. Choosing the correct battery will ensure that your key fob functions effectively. Replace the battery cap and then install the new battery. Be careful not damage the rubber ring that holds the battery. Finally, press the two halves of the key fob until you hear an audible click. How do you reset the Keyless Entry System The Mazda 3 key fob is not just a piece of equipment for convenience. It also serves as a security feature. If you lose your key, or have it stolen the car won't start even if you have the spare key fob. The key fob must be reprogrammed by a dealer to make it work again. It can be a stressful and costly ordeal. Therefore, it's recommended to understand how you can reset the system. Disconnect the battery from the system for 15 minutes. This will eliminate any residual electricity from the on-board computer. Then, disconnect both the LF-ECU connector and the demand switch connectors. Then, verify the continuity between the following terminals: Place the key in the slot, then turn the ignition ON. Keep mazda 2 replacement key fob g28carkeys.co.uk in place for around five seconds, and then switch off. The key's details are now stored in the car's computer and the new fob can start your car. You can program up to three fobs however, you should only use one at each time. This stops unauthorized individuals from copying the key and gaining access to your vehicle. You can purchase a new keyfob on the internet, but it still needs to be cut and programmed by a dealer.