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How to Add, Change, and Reprogram a Mazda 3 Spare KeyIt's a good idea to have an extra key on hand regardless of whether you lost your keyfob or it was unable to function. This article will tell you how to add, change or reprogramme the Mazda 3 keyfobs.Be aware that some keys require programming from an expert locksmith, while others do not. Be sure to only use genuine Mazda replacements for your key fob.How do you add an additional keyIf you're unable to find a spare key from the dealer when you buy your Mazda 3 or accidentally break the one you have but don't worry, 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 items and are ready to access the key fob and replace the battery. First, locate the auxiliary key release button. It's on the underside of the metal piece and is easy to locate. When you press the button, the cover should fall off right away. Next, insert the head of the screwdriver into the notch or the space on the top of the metal piece and pry it off.Insert your spare key or a new one into the slot after you have removed the secondary key. Set the ignition to ON, and wait about five seconds before setting it to off. This will allow the system to recognize the new key and begin your vehicle in the future.It is important to remember that you can only program up to three keys on your Mazda 3. You don't want to use more than two key fobs to start your car. This is a safety precaution that is designed to block unauthorized users, like valet drivers who are not authorized to use your key and thereby launching your vehicle.How to reprogram an unrepaired key?If you have a spare key it's best to know how to reprogram it in the event that the original key you had is lost or stolen. This will prevent unauthorised persons from getting into your car and causing damage to it. This will work with any Mazda. You'll require two keys that are working to start the reprogramming process. If you don't have two functioning keys, you'll need bring your vehicle to the dealership to complete the process.Begin by getting into your driver's seat, and close the door, except for the one that's opened. Place mazda 5 key fob replacement G28 Car Keys working key into the slot, then turn the ignition to ON. Wait for five seconds, then remove the key and repeat the procedure with the second working key.After you've completed programming your new key, you should have three working keys that you can use to start your car in the future. Test each key to make sure they're working correctly before taking them off.It's a good idea 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 purchase one on the internet or in your local auto store. Be sure to go through reviews prior to purchasing to ensure that you don't get a key fob which isn't compatible with your car.How do you change the battery on a spare key?There's nothing worse than discovering that your key fob battery has failed and you are unable to unlock your car. Luckily, it's easy to replace the battery and save yourself some cash at the dealership.The first step is to press the auxiliary button on the back of the key fob. This will take out the key's metal cover and reveal two slots on the opposite side of the case. Place the flathead in one of these slots and then gently push the two halves of the case apart. Once the battery has been fully exposed, take it out of the case and place it in a place where you won't forget it.Before you begin, be sure that you have a brand new replacement battery. They can be bought at any store selling batteries or from a Mazda dealer in Winter Garden. The correct battery is vital to ensure that your keyfob is working correctly.Replace the cap of the battery and then install the new battery. Be careful not to scratch the small rubber ring that the battery rests on. The two halves should be pressed together until you hear the click.How to reset the system's Keyless Entry SystemThe Mazda 3 key fob is not just a practical feature. It also serves as an element of security. If you lose your key, or have it stolen the car won't start, even if you have the spare key fob. The key fob needs to be reprogrammed by a dealer to allow it to work again. This can be a costly and frustrating ordeal therefore it's a great idea to know how to reset the system yourself.Remove the battery from the system for 15 minutes. This will take out any remaining electrical power in the on-board computer. Then, disconnect the LF ECU and demand switch connectors. After that, test for continuity between the following terminals:To program an entirely new key or spare, insert it into the slot and turn the ignition to ON. Put the key in for about five seconds and then switch off. The key information will now be added to your vehicle's computer, and the new fob will be able to start your car in the future. You can program up to three fobs however, you should only use one at a time. This will stop unauthorised people from copying the key and gaining access to your car. You can purchase a brand new keyfob online, but it still needs to be programmed and cut by an authorized dealer.