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How to Add, Change, and Reprogram a Mazda 3 Spare KeyWhether you dropped your key fob on the ground or it has stopped working, it’s best to have an extra key available. This article will explain everything you should be aware of when adding, changing, and changing the programming of your Mazda 3 key fobs.A word of warning: some keys require programming by a locksmith professional or dealer, while other keys do not. Make sure to use official Mazda replacements for your key fob.How do you add a spare keyIf you’re unable to find a spare key from the dealer when you purchase your Mazda 3 or accidentally break the one you have, don’t worry — there’s still an option to get another key. To do this, you’ll need an incredibly small screwdriver, a flathead screwdriver, and an CR2025 battery that’s new. Once you have these items you can access the key fob and swap the battery. First find the key release button for the auxiliary key. It’s located on the underside the metal portion. It’s easy to locate. Once you press the button, the back cover should fall off right away. Then, you can insert the screwdriver’s tip into the notch on top or the space, and pry the metal part off.Insert your new or spare key into the slot after you have removed the secondary key. Turn on the ignition and then wait for around five seconds before turning it to off. This will register the new key’s information to the system, allowing it to start your vehicle in the future.It’s important to keep in mind that you can only program up to three keys on your Mazda 3. The final thing you 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 prevent unauthorized users, like valet drivers, from activating your key and starting your vehicle.How do you reprogram a spare key?If you have a spare key, it’s a good idea know how to reprogram it in the event that the original key you had is stolen or lost. This will stop unauthorized persons from abusing your vehicle and re-starting it. mazda 2 key fob G28 should work with any Mazda. You will require two keys that work to begin the reprogramming process. If you don’t have the two working keys, you’ll have to take your vehicle to a dealership to have it done.Begin by putting yourself in the driver’s seat, and close the door, with the exception for the one that’s already opened. Insert the first working key into the slot, then set the ignition to the ON position. 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 you can use to start your car in the future. Test each key to ensure sure they’re working correctly before throwing them away.It’s a good idea to buy a spare Mazda 3 key fob, especially if you’re a driver who has a tendency to lose their keys or has other issues with it. You can find one online or at your local automotive store, but be sure to read the reviews prior to purchasing so you aren’t buying one that’s not compatible with your car.How do I change the battery on a spare key?It’s very frustrating to discover that your key fob is dead and you’re not able to unlock your car. It’s easy to change the battery yourself and save money at the dealership.Press the auxiliary button on the back of the keyfob. This will remove the key that is used as an auxiliary key, and expose a slot on both sides of the case. Press the flathead into one of these slots, and then gently push the two halves apart. Once the battery is fully exposed, take it out and place the case somewhere that you won’t forget about it.Before you start, make sure you have a brand new replacement battery. These batteries can be purchased from any store that sells batteries or from a Mazda dealer in Winter Garden. Choosing the correct battery will ensure that your key fob functions properly.Replace the cap on the battery, and then replace the battery. Be careful not to damage the small rubber ring the battery sits on. Finally, press the two parts of the key fob together until you hear the sound of clicking.How do I reset a Keyless Entry SystemThe Mazda 3 key fob is not just a practical feature. It also serves as a security measure. The car won’t start if the key is stolen or lost, even if you’ve got an extra fob. This is because the key fob needs to be reprogrammed at the dealership to work properly. This can be an expensive and frustrating experience, so it’s a good idea to understand how to reset the system yourself.To reset the system, disconnect the battery for around 15 minutes. This will take out any remaining electricity in the on-board computer. Then, disconnect the LF ECU and demand switch connectors. Check 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 about five seconds. The key information will now be added to the vehicle’s computer, and the new fob will be able to start your car in the future. You can program as many fobs as you need but only one can be in use at any specific time. This stops unauthorized individuals from copying your key and gaining access to your car. You can buy a new keyfob online, but it will still need to be programmed and cut by an authorized dealer.