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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 in your pocket no matter if you’ve dropped the keyfob or it has stopped working. This article will go over everything you must know about changing, adding, and programming your Mazda 3 key fobs.A word of caution Certain keys need to be programmed by a professional locksmith or dealer, whereas others don’t. Make sure to make use of official Mazda replacements for your key fob.How to Add mazda keys locked in carIf you’re not fortunate enough to find a spare key from the dealer when you purchase your Mazda 3 or accidentally break your current key do not fret — there’s still an option to get another key. You’ll need to use a flathead screwdriver, and an CR2025 battery. Once you’ve got these tools and are ready to access the key fob and swap the battery. Find the key release auxiliary. It’s located underneath the metal portion and is easy to find. The cover on the back should fall off the moment you press the button. Then, you can insert the screwdriver’s head into the notch or the space on the top of the metal piece and pry it off.After the auxiliary keys are removed, insert your new or spare key into the slot. Turn on the ignition and wait for five seconds, then turn it to off. This will register the new key’s information into the system which will allow it to start your vehicle in the future.It is important to remember that you can only program up to three keys for your Mazda 3. You don’t want to have to utilize more than two keys to start your vehicle. This is a security measure to prevent unauthorized users from activating your keys and then starting your car.How to Reprogram a Spare KeyIt’s smart to know how to reprogram an extra key in the event that the original key is lost or stolen. This will prevent unauthorised persons from abusing your vehicle and re-starting it. This should work with any Mazda. You’ll need two keys that are functioning to begin the reprogramming. If you don’t have two keys that work it’s recommended to take your Mazda to a dealer to get this completed.Begin by stepping into your driver’s seat, and close the door, with the exception for the one that’s been opened. Place the working key in the slot, and then set the ignition to ON. After five seconds, take the key out and repeat the process with the second key.Once you’ve programmed your new key, you should have three working keys that you can use to start your vehicle in the future. Test each key to make sure that they’re working properly before placing them away.You should think about buying an extra Mazda 3 remote, especially in the event that your vehicle is prone to problems. You can buy one online or in your local automotive store. Make sure you read reviews before purchasing to ensure that you don’t purchase a key fob which isn’t compatible with your vehicle.How to Change the Battery on a Spare KeyThere’s nothing more frustrating than discovering that the battery in your key fob has gone out and you’re not able to unlock your car. It’s easy to replace the battery yourself and save money at the dealer.Press the auxiliary key button at the back of the keyfob. This will remove the auxiliary key and expose two slots on the sides of the case. Place the flathead in one of these slots and then gently pry the two halves of the case apart. Once the battery is fully exposed, take it out and place it in a safe place somewhere that you won’t forget about it.Be sure to have an extra battery in place before you start. You can purchase them in any store that sells batteries or at an Mazda dealer near Winter Garden. The correct battery is essential to ensure that your keyfob works correctly.Replace the cap of the battery and then put in the new battery. Be careful not damage the rubber ring that holds the battery. Press the two halves together until you hear a click.How to Reset the Keyless Entry SystemThe Mazda 3 key fob is not just a piece of equipment for convenience. It also serves as a security measure. The car will not start if your key is stolen or lost, even if you’ve got a spare key fob. The key fob needs to be reprogrammed by a dealer to allow it to work again. This could be a costly and frustrating experience, so it’s a good idea to learn how to reset the system yourself.To reset the system, disconnect the battery for around 15 minutes. This will remove any remaining electrical current from the computer on board. The next step is to disconnect the LF-ECU and demand switch connectors. Check for continuity between the 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 and then switch it off. The key’s details will be added to your vehicle’s computer and the new fob will be able start your vehicle in the future. You can program as many fobs as you need, but only one should be in use at any particular time. This will prevent unauthorised people from stealing your key and gaining access to your vehicle. You can buy a new key fob online, but you’ll need to visit a locksmith or dealer in order to cut it and programmed.