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How to Add, Change, and Reprogram a Mazda 3 Spare KeyIf you’ve dropped your key fob on the ground or it simply stopped working, it’s a good idea to have a spare key on hand. This article will explain how to add, modify, and reprogramme your Mazda 3 keyfobs.A word of warning Certain keys require programming by a professional locksmith or dealer, whereas other keys don’t. 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 find a spare key from the dealer when you buy your Mazda 3 or accidentally break your current key but don’t worry, there is still a way to add another key. To do this, you’ll need an incredibly small screwdriver, a flathead screwdriver, and an updated CR2025 battery. Once you’ve got these tools and are ready to access the key fob to change the battery. Locate the auxiliary key release. It’s located on the underside of the metal component and is easy to locate. The back cover should slide off when you press the button. Then, insert the screwdriver’s head into the notch at the top or into the space and remove the metal part.Insert your new or spare key into the slot after taking out the auxiliary key. Turn on the ignition and then wait for around five seconds, and then turn it to OFF. This will allow the system to recognize the new key and begin your vehicle in the future.It is important to remember that you can only program up to three keys on your Mazda 3. The last 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 security measure designed to prevent unauthorized users, like valet drivers, from activating your key and starting your vehicle.How to Reprogram a Spare KeyIf you have a spare key, it’s a good idea know how to program it in the event the original key you had is stolen or lost. This will stop unauthorized persons from taking your car and then starting it. This will work with any Mazda. You’ll require two keys that are functioning to begin the reprogramming. If you don’t have two keys that function then it’s best to bring your car to a dealer to get this completed.Begin by stepping into the driver’s seat, close all the doors, except the one that is open. Place the first working key into the slot, then turn the ignition to the ON position. Wait for five seconds, then remove the key and repeat with the second key.After programming replacement mazda key , you’ll have 3 keys that will be able to start your vehicle in the future. Before storing each key, make sure it’s working properly.You should consider buying an extra Mazda 3 remote, especially in the event that your vehicle is prone to issues. You can purchase one on the internet or in your local auto store. Make sure you read reviews before purchasing to ensure you don’t buy one that’s not compatible with your vehicle.How do you change the battery using a spare keyThere’s nothing worse than discovering that the battery for your key fob has been damaged and you’re unable to unlock your car. It’s easy to replace the battery yourself and save money at the dealer.Press the auxiliary key button located at the back of the keyfob. This will release the metal key auxiliary and reveal two slots on the sides of the case. Put the flathead screwdriver in one of these slots and gently remove the two parts of the case. When the battery is completely exposed, take it out and place it in a safe place somewhere you won’t forget it.Be sure to bring a replacement battery prior to starting. You can find these at any retailer that sells batteries or at an Mazda dealer close to Winter Garden. The right kind of battery is crucial to ensure that your keyfob is working properly.Replace the cap on the battery, and then put in the new battery. Be careful not to damage the small rubber ring the battery is placed on. Press the two halves together until you hear a click.How to Reset a Keyless Entry SystemThe key fob inside your Mazda 3 is not only an added convenience, but it’s also an important security feature. The car will not start if the key is lost or stolen even if you have an extra fob. The key fob needs to be reprogrammed by a dealer to make it work again. It can be a stressful and costly ordeal. Therefore, it’s recommended to learn how you can reset the system.Disconnect the battery from the system for 15 minutes. This will eliminate any remaining electrical power in the on-board computer. Then, disconnect the LF -ECU and demand switch connectors. Then, check continuity between the following terminals:To program a new key, or a spare, insert it into the slot and set the ignition to ON. The key should remain in the ignition for about five seconds, then switch off. The key’s details will be transferred to your vehicle’s computer and the new fob will be able to start your vehicle in the future. You can program up to three fobs but you should only use one at one time. This will stop unauthorized individuals from stealing your keys and gaining access to your car. You can purchase a brand new keyfob from the internet, however it still needs to be cut and programmed by a dealer.