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How to Add, Change, and Reprogram a Mazda 3 Spare KeyIt's a good idea always to keep an extra key at hand in case you lose the keyfob or it was unable to function. This article will provide everything you must be aware of when changing, adding, and changing the programming of your Mazda 3 key fobs.Certain keys require programming by an experienced locksmith, whereas others don't. Be sure to only use official Mazda replacements for your key fob.How to Add mazda 3 key replacement G28If you're unable to get a spare key from the dealership when you buy your Mazda 3 or accidentally break the one you have but don't worry, there's still a way to add another key. To accomplish this, you'll need an inexpensive flathead screwdriver as well as an updated CR2025 battery. Once you've got these tools then it's time to remove the key fob and change the battery. First, locate the auxiliary key release button. It's located beneath the metal part. It's easy to find. When you hit the button, the back cover should fall off right away. Then, you can insert the screwdriver head into the notch on top or the space and remove the metal part.After the auxiliary key has been removed, insert the new or spare key into the slot. Switch the ignition on and wait for about five seconds, then turn it to OFF. This will allow the system to recognize the new key and begin your vehicle in the future.It is only possible to program three keys to your Mazda 3. The one thing you don't want is to have more than two functioning key fobs and not being in a position to get your vehicle started. This is a security measure designed to stop unauthorized users, such as valet drivers who are not authorized to use your key and thereby launching your vehicle.How do you reprogram a spare keyIt's a smart idea to learn how you can reprogram a spare key in the event that your original key gets lost or stolen. This will stop unauthorised people from getting into your car and causing damage to it. This process is compatible with any Mazda however you'll need two working keys to begin the reprogramming. If you don't own two keys that function it's recommended to take your Mazda to a dealer to have this completed.Begin by getting in your driver's seat, and close the door, with the exception for the one that's opened. Set the ignition to ON and then insert the first working key. Wait for five seconds, then remove the key and repeat the process with the second working key.After you've programmed your new key you should have three keys that will be able to start your vehicle in the future. Test each key to make sure that they're operating correctly before throwing them away.It's a good idea to purchase an extra Mazda 3 key fob, especially if you're someone who is prone to losing keys or has other issues with it. You can purchase one on the internet or in your local automotive store. Make sure you review the reviews before buying to ensure that you don't get a key fob which isn't compatible with your car.How do you change the battery using a spare keyThere's nothing more frustrating than discovering that the battery on your key fob gone out and you're not able to unlock your vehicle. It's easy to change 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 auxiliary to reveal a slot on both sides of the case. Press the flathead screwdriver into one of these slots, and gently remove the two halves of the case. After the battery is fully exposed, remove the case and place it somewhere you will not forget about it.Be sure to bring an additional battery prior to beginning. You can find these at any store that sells batteries or at an Mazda dealer near Winter Garden. The correct battery is vital to ensure that your key fob functions correctly.Next, put the replacement battery in the correct place and replace the cap of the battery. Be careful not to damage the small rubber ring the battery rests on. The two halves should be pressed together until you hear the click.How can I reset the Keyless Entry SystemThe key fob inside your Mazda 3 is not only an option for convenience, it's an important security feature. If you lost your key or had it stolen, the car will not start even if you have the spare key fob. This is because the key fob needs to be reprogrammed at the dealership to work once more. This could be a costly and time-consuming process It's a good idea to understand how to reset the system yourself.To reset the system, remove the battery for 15 minutes. This will remove any remaining electricity from the on-board computer. Then, disconnect both connectors for the LF-ECU and the demand switch connectors. Then, verify the continuity between the following terminals:To program an entirely new key or spare, place it in the slot and set the ignition to ON. The key should remain in the ignition for around five seconds and then turn off. The key's information will be added to the vehicle's computer and the new fob will be able to start your vehicle in the future. You can program any number of fobs you would like, but only one should be in use at any given time. This will stop unauthorized individuals from stealing your keys and getting access to your car. You can buy a new keyfob online, however it still needs to be programmed and cut by an authorized dealer.