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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 an excellent idea to keep an extra key available. This article will teach you how to add, alter and re-programme your Mazda 3 keyfobs. A word of caution Certain keys require programming by a locksmith professional or dealer, while others do not. Be sure to only make use of official Mazda replacements for your key fob. How do I add a spare key? If you're not fortunate enough to receive a spare keys from the dealership when you buy your Mazda 3 or accidentally break the one you have, don't worry — there's still a way to add another key. You'll need to use the flathead screwdriver, as well as the CR2025 replacement battery. Once you've got all the equipment, it is time to open the key fob. First find mazda rx8 key fob . The button is located on the bottom of the metal part. It's easy to find. The cover on the back should fall off as soon as you press the button. Then, insert the screwdriver's head into the notch at the top or in the space, and remove the metal part. After the auxiliary keys are removed, insert your new or spare key into the slot. Set the ignition to ON, and wait for around five seconds before setting it to OFF. This will add the new key's information to the system and allow it to start your car in the future. It's important to note that you can only program up to three keys on your Mazda 3. The one thing you don't want is to have more than two functioning key fobs and not be in a position to get your vehicle started. This is a security measure to stop anyone who is not authorized from activating your keys and then starting your car. How to Reprogram a Spare Key If you have a spare key it's a good idea know how to reprogram it in the event that the original key you had is lost or stolen. This will stop unauthorized persons from taking your car and then starting it. This should work with any Mazda. You'll require two keys that are working to start the reprogramming process. If you don't own two keys that work it's recommended to take your car to a dealer to get this done. Begin by stepping into the driver's position and closing all the doors except the one that is open. Put the first working key into the slot, then turn the ignition to the ON position. Then wait five seconds before taking out the key. Repeat with the second key. Once you've completed programming your new key, you'll have three keys that will be able to start your vehicle in the future. Check each key to make sure they're working correctly before taking them off. You should think about purchasing a spare Mazda 3 remote, especially in the event that your vehicle is prone to problems. You can find one online or at your local automobile retailer, but make sure to read reviews before buying so that you can avoid purchasing the wrong key fob compatible with your vehicle. How to change the battery on a spare key It's depressing to find out that your key fob is dead and you're not able to unlock your car. Luckily, it's easy to replace the battery and save yourself some cash at the dealership. The first step is to press the auxiliary key button that is located on the back of the key fob. This will detach the metal key and reveal a slot on each side of the case. Press the flathead screwdriver into one of these slots and gently break the two parts of the case. Once the battery is fully exposed, remove it and place it in a safe place somewhere safe from being lost. Be sure to have an additional battery prior to beginning. They can be bought at any store selling batteries or from a Mazda dealer in Winter Garden. Using the right type of battery will ensure that your key fob works perfectly. Replace the cap on the battery, and then insert the new battery. Be careful not damage the rubber ring that holds the battery. 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 piece of equipment for convenience. It's also an element of security. The car will not start if your key is lost or stolen, even if you've got a spare fob. This is because the fob that you have to be reprogrammed by the dealership in order to work properly. This can be a costly and time-consuming process therefore it's a great idea to learn how to reset the system yourself. Disconnect the battery from the system for 15 minutes. This will clear any residual electrical current from the computer on board. Then, disconnect the LF ECU and demand switch connectors. Then, check continuity between the following terminals: Place the key into the slot, then switch on the ignition. Leave the key in for about five seconds, then switch off. The information from the key will be transferred to your vehicle's computer, and the new fob will be able to start your car in the future. You can program any number of fobs you want, but only one should be used at a specific time. This will stop unauthorised people from copying your key and gaining access to your vehicle. You can purchase a replacement keyfob on the internet, but it must be programmed and cut by an authorized dealer.