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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 an extra key available. This article will cover everything you need to be aware of when the process of adding, changing, and programming your Mazda 3 key fobs.A word of warning Certain keys require programming by a locksmith professional or dealer, while others don’t. Make sure you use only authentic Mazda replacements to replace your key fob.How to add a spare keyIf you’re not lucky enough to find a spare key from the dealer when you purchase your Mazda 3 or accidentally break the one you have do not fret — there is still an option to make another key. To accomplish this, you’ll need an incredibly small screwdriver, a flathead screwdriver, and a new CR2025 battery. Once you’ve got these tools you can open up the key fob and change the battery. First find the button that allows you to release the key. It’s located underneath the metal component and is easy to locate. When you press the button, the back cover will fall off instantly. Then, insert the screwdriver head into the notch at the top or the space and take the metal part away.After the auxiliary key has been removed, insert your new or spare key into the slot. Turn on the ignition and wait for approximately five seconds, and then turn it to off. This will add the new key’s details to the system, allowing it to start your car in the future.It’s important to keep in mind that you can only program up to three keys for your Mazda 3. The final thing you want is to have more than two functioning key fobs and not being able to get your car started. This is a safety measure to stop unauthorized users from activating your keys and launching your vehicle.How to reprogram an unrepaired key?If you have a spare key it’s important to be aware of how to reprogram it in the event that the original key you had is lost or stolen. This will prevent unauthorized people from starting your car, or taking it. This process should work on any Mazda but you’ll need two working keys to start the reprogramming. If you don’t have two keys that work, you should take your car to a dealer to get this completed.Begin by stepping into your driver’s seat and closing the door, except for the one that’s opened. Put the first working key in the slot, and then set the ignition to the ON position. Then wait five seconds before taking out the key. Repeat with the second key.After you finish programming your new key, you’ll have three keys that will be able to start your car in the future. Test each key to ensure sure that they’re operating correctly before throwing them away.It’s a good idea to buy an extra Mazda 3 key fob, especially if you’re someone who has a tendency to lose their keys or has other issues with it. You can buy one online or at your local auto retailer, but make sure to read the reviews prior to purchasing so you aren’t purchasing a key fob that’s not compatible with your vehicle.How do I change the battery with a spare key?It’s depressing to find out that the key fob you used to use has gone out and you’re in a position to not unlock your car. Fortunately, G28 Car Keys Solutions to replace the battery and save some cash at the dealership.Press the auxiliary button on the back of the keyfob. This will remove the metal key that is used as an auxiliary key, and expose a slot on both sides of the case. Place the flathead in one of these slots, and then gently pry the two halves apart. Once the battery has been fully exposed, remove the case and put it somewhere you will not forget it.Be sure to have a new battery ready before you start. They can be bought at any store that sells batteries or from a Mazda dealer in Winter Garden. The correct type of battery is vital to ensure that your keyfob is working properly.Replace the cap of the battery and then install the new battery. Be careful not damage the rubber ring on which the battery rests. Then press the two halves of the key fob together until you hear an audible click.How do I reset the Keyless Entry SystemThe Mazda 3 key fob is not just a practical feature. It also serves as a security feature. The car will not start if your key is lost or stolen even if you have an extra fob. This is because the fob that you have to be reset at the dealership to work properly. This could be a costly and time-consuming process, so it’s a good idea to know how to reset the system yourself.To reset the system, unplug the battery for approximately 15 minutes. This will eliminate any remaining electrical power in the on-board computer. Then, disconnect the LF-ECU connector and the demand switch connectors. Check for continuity between the terminals.To program a new key, or a spare, place it in the slot and turn the ignition to ON. Stop the ignition after about five minutes. The key’s information is added to the computer in your car and the new fob is able to start your vehicle. You can program up to three fobs, but you should only use one at each time. This will prevent unauthorized people from stealing your keys and gaining access to your vehicle. You can buy a new key fob online, however you’ll still have to visit an expert locksmith or dealer to cut it and get it programmed.