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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea always to have an extra key at hand in case you lose your keyfob, or it stopped working. This article will explain how to add, change or reprogramme your Mazda 3 keyfobs. Warning: Some keys require programming by professional locksmiths, while others do not. Make sure to use official Mazda replacements for your key fob. How do I add a spare key If you're unable to find a spare key from the dealer when you buy your Mazda 3 or accidentally break the one you have, don't worry — there is still the option of adding another key. To do replacement mazda key , you'll need a small flathead screwdriver and an CR2025 battery that's new. Once you have the items, it is time to open the key fob. First find the auxiliary key release button. It's on the underside of the metal piece and is easy to locate. The back cover should come off as soon as you press the button. Next, place the head of the screwdriver into the notch or spacing on the top of the metal part and pull it away. Insert your spare or new key into the slot after you have removed the additional key. Set the ignition to ON, and wait for around five seconds before turning it to OFF. This will add the new key's information into the system which will allow it to start your car in the future. It is important to remember that you can only program up to three keys for your Mazda 3. You don't want to have to utilize more than two key fobs in order to start your vehicle. This is a safeguard to stop unauthorized users from activating your keys and starting your car. How to reprogram a spare key? It's a smart idea be aware of how to reprogram a spare key in the event that the original key is lost or stolen. This will stop unauthorized persons from taking your car and then starting it. This will work with any Mazda. You'll need two keys that work to start the reprogramming process. If you don't have two working keys, you'll need to take your vehicle to a dealership to complete the process. Begin by getting in your driver's seat, and close the door, except for the one that's been opened. Set the ignition to ON and then insert the first working key. Take five seconds before removing the key. Repeat with the second key. After you've completed programming your new key, you should have three working keys that you can use to start your car in the future. Before saving each key, be sure that it's functioning properly. You should think about purchasing a spare Mazda 3 remote, especially in cases where your car is prone to issues. You can buy one online or at a local automotive store. Be sure to review the reviews before buying to ensure you don't buy one that's not compatible with your car. How to Change the Battery on a spare key It's awful to discover that your key fob has died, and you are unable to unlock your car. It's easy to change the battery yourself and save money at the dealership. The first step is to press the auxiliary button on the back of the key fob. This will remove the metal key auxiliary to reveal an opening on both sides of the case. Put the flathead screwdriver in one of these slots and gently take apart the two sides of the case. When the battery is completely exposed, take it out and set aside the case somewhere safe from being lost. Before you begin, be sure you have a brand new replacement battery. They can be bought at any retailer that sells batteries or from a Mazda dealer in Winter Garden. The right type of battery is crucial to ensure that your keyfob is working properly. Next, put the replacement battery in the correct place and replace the cap on the battery. Be careful not to scratch the small rubber ring the battery is placed on. 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 practical feature. It's also a security measure. The car will not start if the key is lost or stolen, even if you've got 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 stressful experience It's a good idea to know how to reset the system yourself. Disconnect the battery from the system for 15 minutes. This will erase any residual electrical current from the computer on board. Then, disconnect both LF-ECU and demand switch connectors. Then, check continuity between the following terminals: Insert the key into the slot, and turn the ignition ON. Keep the key in place for about five seconds and then turn off. The information from the key will be added to your vehicle's computer and the new fob will be able to start your car in the future. You can program up to three fobs, but you must only use one at each time. This will prevent unauthorised people from stealing your keys and gaining access to your vehicle. You can purchase a new key fob on the internet, but you'll still need to go to an authorized locksmith or dealer to cut it and programmed.