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How to Add, Change, and Reprogram a Mazda 3 Spare KeyWhether you dropped your key fob on the floor or it has stopped working, it’s recommended to keep an extra key in your pocket. This article will show you how to add, modify and re-programme your Mazda 3 keyfobs.Warning: Some keys require programming from an expert locksmith, while others do not. Use only official Mazda replacements to replace your key fob.How do I add an extra keyIf you’re unable to get a spare key from the dealer when you buy your Mazda 3 or accidentally break your current one Don’t fret, there’s an option to get another key. To accomplish this, you’ll need an inexpensive flathead screwdriver as well as an updated CR2025 battery. Once you have the items you need, it’s time to open the key fob. First look for the auxiliary key release button. It’s located on the underside of the metal component and is easy to locate. When you press the button, the cover should fall off right away. Then, insert the head of the screwdriver into the notch or spacing on the top of the metal piece and pull it off.Insert your spare key or a new one into the slot following the removal of the auxiliary key. Set the ignition ON and wait for five seconds, then turn it to off. This will add the new information on the key to the system which will allow it to start your car in the future.You can only 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 vehicle. This is a security measure to stop anyone who is not authorized from activating your keys and launching your car.How to reprogram a spare key?If you have a spare key it’s important to be aware of how to program it if your original key gets stolen or lost. mazda replacement key will prevent unauthorized people from starting your car or taking it. This should work with any Mazda. You’ll need two keys that work to begin the reprogramming process. If you don’t have two keys that work then it’s best to bring your Mazda to the dealer to get this completed.Start by stepping into driver’s seat, shutting all doors, with the exception of the one that is open. Set the ignition to ON and insert the first working key. Wait five seconds, then remove the key and repeat the process with a second key.After programming your new key, you’ll have three keys that start your car in the near future. Before you store each key, make sure it’s working properly.It’s a good idea to purchase an extra Mazda 3 key fob, especially if your car is one who has a tendency to lose their keys or has other issues with it. You can buy one online or at your local auto store, but be sure to read reviews prior to purchasing so you aren’t buying a key fob that’s not compatible with your car.How do I change the battery using a spare keyIt’s a nightmare to discover 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.Press the auxiliary key button on the back of the keyfob. This will take out the key made of metal and reveal a slot on each side of the case. Press the flathead screwdriver into one of these slots, and gently take apart the two halves of the case. When the battery is fully exposed, remove the case and put it in a place where you won’t forget about it.Before you start, make sure you have a new replacement battery. They are available at any store that sells batteries or at a Mazda dealer close to Winter Garden. Using the correct type of battery will ensure that your key fob operates properly.Replace the cap on the battery and then install the new battery. Be careful not to scratch the small rubber ring the battery sits on. Finally, press the two halves of the key fob until you hear an audible click.How to reset a Keyless Entry SystemThe key fob inside your Mazda 3 is not only an extra convenience, but also an important security feature. If you lose your key or had it stolen the car will not start even if you have the spare fob. This is because the key fob needs to be reprogrammed at the dealership in order to work properly. It’s a difficult and costly experience. Therefore, it’s recommended to know how to reset the system.To reset the system, disconnect the battery for 15 minutes. This will erase any residual electrical power in the on-board computer. Next, disconnect both the LF-ECU connector as well as the demand switch connectors. After that, test for continuity between the following terminals:To program a new key, or a spare, place it in the slot and turn the ignition to ON. Stop the ignition after approximately five minutes. The key’s details are now transferred to the computer of your vehicle and the new fob will start your car. You can program as many fobs you would like however only one should be in use at any specific time. This will keep unauthorised individuals from stealing your key and gaining access to your vehicle. You can purchase a new keyfob on the internet, but it’ll still need to be programmed and cut by an authorized dealer.