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How to Add, mazda replacement keys , and Reprogram a Mazda 3 Spare Key Whether you dropped your key fob on the ground or it has stopped working, it's always recommended to keep an extra key available. This article will show you how to add, alter and re-programme your Mazda 3 keyfobs. A word of caution Some keys require programming by a professional locksmith or dealer, while others don't. Be sure to only use official Mazda replacements for your key fob. How do I add an additional key If you're unable to find a spare key from the dealer when you purchase your Mazda 3 or accidentally break the one you have but don't worry, there's an option to make another key. You'll need a flathead screwdriver, and the CR2025 replacement battery. Once you've got the tools then it's time to open up the key fob to change the battery. Find the key release auxiliary. The button is located on the underside of the metal portion. It's easy to locate. Once you hit the button, the back cover should fall off right away. Then, you can insert the screwdriver's head into the notch at the top or the space and take the metal part away. Insert your spare or new key into the slot after removing the auxiliary key. Switch the ignition on and wait for approximately five seconds, then set it to OFF. This will allow the system to recognize the new key and start your vehicle in the future. It is important to remember that you can only program up to three keys for your Mazda 3. The final thing you want is to have more than two working key fobs and not be in a position to get your vehicle started. This is a safety precaution designed to prevent unauthorized users, like valet drivers who are not authorized to use your key and starting your car. How do I reprogram an unrepaired key It's a smart idea be aware of how to reprogram an extra key in the event that your original key is lost or stolen. This will stop unauthorised people from starting your car, or stealing it. This procedure should work with any Mazda however, you'll require two keys that work to begin the reprogramming process. If you don't have two working keys, you'll need take your vehicle to a dealership to get it done. Begin by putting yourself in the driver's seat, and closing the door, except for the one that's already opened. Turn the ignition on and insert the first working key. After five seconds, take the key out and repeat the process with a second working key. After you've programmed your new key, you should have three working keys you can use to start your vehicle in the future. Test each key to be sure that they're working properly before placing them away. You should think about buying an extra Mazda 3 remote, especially if your car is prone to issues. You can purchase one on the internet or at a local automotive store. Make sure you look up reviews before you purchase to ensure that you don't purchase the wrong key fob that isn't compatible with your car. How do you change the battery on a spare key? It's depressing to find out that your key fob is dead and you're in a position to not unlock your vehicle. It's easy to replace the battery yourself and save money at the dealer. The first step is to press the auxiliary key button located on the back of the key fob. This will take out the metal key that is used as an auxiliary key, and expose an opening on both sides of the case. Put the flathead screwdriver in one of these slots. Then, gently remove the two sides of the case. After the battery is fully exposed, remove the case and put it in a spot where you'll never forget about it. Before you start, make sure that you have a brand new replacement battery. You can find these at any store that stocks batteries or at a Mazda dealer close to Winter Garden. The correct type of battery is vital to ensure that your key fob functions properly. Then, place the new battery in the correct place and replace the cap on the battery. Be careful not to scratch the rubber ring on which the battery rests. Finally press the two halves of the key fob together until you hear the sound of clicking. How to Reset a Keyless Entry System The Mazda 3 key fob is not just a convenience. It's also an element of security. The car won't start if the key is stolen or lost even if you have an extra fob. This is because the key fob needs to be reprogrammed by the dealership in order to work properly. It can be a frustrating 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 remaining electric current from the onboard computer. Next, disconnect both the LF-ECU connector and the demand switch connectors. After that, test for continuity between the following terminals: Insert the key into the slot, and switch on the ignition. Switch off the ignition after approximately five seconds. The key's information will be saved to your car's computer, and the new fob will be able start your vehicle in the future. You can program as many fobs as you desire, but only one should be used at a specific time. This will keep unauthorised individuals from stealing your keys and getting access to your car. You can purchase a new keyfob online, but it still needs to be cut and programmed by an authorized dealer.