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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 on hand no matter if you've dropped the keyfob or it stopped working. This article will cover everything you must be aware of when the process of adding, changing, and changing the programming of your Mazda 3 key fobs. Warning: Some keys require programming by professional locksmiths, while others don't. Use only official Mazda replacements to replace your key fob. How do I add a spare key? If you're not lucky enough to find a spare key from the dealership when you purchase your Mazda 3 or accidentally break the one you have do not fret — there's still an option to get another key. To accomplish this, you'll need an incredibly small screwdriver, a flathead screwdriver, and an updated CR2025 battery. Once you've got all the equipment and tools, you're ready to open the key fob. Find the auxiliary key release. The button is located beneath the metal part. It's easy to locate. The cover that covers the back should come off the moment you press the button. Next, place the head of the screwdriver into the notch or spacing on the top of the metal component and pull it away. Insert the spare or new key into the slot after you have removed the accessory key. Turn on the ignition and then wait for around five seconds, and then turn it to OFF. This will register the new key's information to the system and allow it to start your vehicle in the future. It is only possible to program three keys into 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 security measure designed to stop unauthorized users, such as valet drivers from activating your key and thereby launching your vehicle. How do you reprogram an unrepaired key? It's a good idea to know how to reprogram a spare key in the event that your original key gets lost or stolen. This will keep unauthorised persons from opening your car or taking it. This should work with any Mazda. You will require two keys that are working to begin the reprogramming. If you don't have two keys that work then it's best to bring your car to a dealer to get this completed. Start by getting into the driver's position, and shutting all doors, with the exception of the one that is open. Set new mazda key to ON and insert the initial working key. Then wait five seconds before taking out the key. Repeat the process with the second key. After you've completed programming your new key, you should have three keys that you can use to start your car in the future. Before you store each key, make sure that it's functioning properly. You should think about purchasing an extra Mazda 3 remote, especially if your car is prone to problems. You can buy one online or at a local automotive retailer, but make sure to read the reviews before purchasing so that you can avoid purchasing the wrong key fob compatible with your car. How to Change the Battery on a spare key There's nothing worse than finding that the battery on your key fob gone out and you're not able to unlock your car. It's a good thing that it's simple to replace the battery and save some money at the dealership. Press the auxiliary button on the back of the keyfob. This will remove the metal key auxiliary and reveal a slot on both sides of the case. Press the flathead into one of these slots and then gently pry the two halves of the case apart. After the battery is fully exposed, remove the case and place it in a spot where you'll never forget about it. Be sure to have a new battery ready before you begin. These batteries can be purchased from any store that sells batteries or from a Mazda dealer in Winter Garden. The right kind of battery is essential to ensure that your key fob functions properly. Then, put the new battery into place and replace the cap on the battery. Be careful not to damage the small rubber ring that the battery rests on. The two halves should be pressed together until you hear the click. How to Reset the Keyless Entry System The Mazda 3 key fob is not just a convenient feature. It's also a security feature. The car will not start if your key is stolen or lost even if you have a spare key fob. The key fob has to be reprogrammed by the dealer to allow it to work again. It can be a frustrating and expensive ordeal. Therefore, it's recommended to know how to reset the system. Disconnect the battery from the system for 15 minutes. This will eliminate any remaining electricity from the on-board computer. Then, disconnect the LF ECU and demand switch connectors. Check continuity between the following terminals. To program the new key or spare, insert it into the slot and turn the ignition to ON. The ignition should be turned off after approximately five minutes. The key's information will be transferred to your vehicle's computer and the new fob will be able start your car in the future. You can program up to three fobs however, you should only use one at each time. This will prevent unauthorised people from stealing your keys and getting access to your car. You can purchase a replacement keyfob from the internet, however it'll still need to be programmed and cut by an authorized dealer.