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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 stopped working, it’s always best to have a spare key handy. This article will explain how to add, change, and reprogramme your Mazda 3 keyfobs.A word of caution Some keys require programming by a locksmith professional or dealer, whereas other keys do not. Make sure you use only genuine Mazda replacements to replace your key fob.How do I add a spare key?You can also add a second key if you don’t have a spare key, or if you accidentally damage the one you already have. To accomplish this, you’ll need an incredibly small screwdriver, a flathead screwdriver, and the new CR2025 batteries. Once G28 got these items, it is time to open the key fob. First find the button that allows you to release the key. It’s located under the metal piece and is easy to locate. The cover that covers the back should come off the moment you press the button. Next, insert the screwdriver’s head into the notch or space at the top of the metal component and pull it away.After the auxiliary keys are removed, insert the new or spare key into the slot. Set the ignition to ON and wait for 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 only possible to program three keys in your Mazda 3. You don’t want to use more than two key fobs in order to start your vehicle. This is a security precaution designed to prevent unauthorized users, such as valet drivers who are not authorized to use your key and starting your car.How to Reprogram a Spare KeyIf you have a spare key, it’s best to know how to reprogram it in the event that your original key gets stolen or lost. This will stop unauthorized persons from starting your car or taking it. This will work with any Mazda. You will require two keys that work to begin the reprogramming process. If you don’t own two working keys, you should take your vehicle to a dealer to get this completed.Begin by putting yourself in the driver’s seat, and shutting the door, excluding for the one that’s open. Set the ignition to ON and insert the first working key. Take five seconds before removing the key. Repeat the process with the second key.After you’ve programmed your new key, you should have three keys that you can use to start your vehicle in the future. Check each key to make sure that they’re functioning properly before throwing them away.It’s a good idea purchase a spare 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 a local automotive store, but be sure to read reviews before buying so you can avoid purchasing an item that isn’t compatible with your vehicle.How to change the battery using a spare keyIt’s depressing to find out that your key fob has failed and you’re unable to unlock your car. Fortunately, it’s easy to replace the battery and save some money at the dealership.Press the auxiliary key button on the back of the keyfob. This will release the metal key auxiliary to reveal an opening on both sides of the case. Put the flathead into one of these slots, and then gently pry the two halves of the case apart. When the battery is completely exposed, remove it and place it in a safe place in a place where you will not forget it.Be sure to have a replacement battery prior to beginning. You can purchase them in any store that sells batteries or at a Mazda dealer close to Winter Garden. The correct battery is essential to ensure that your keyfob is working correctly.Replace the cap of the battery and then insert the new battery. Be careful not to damage the small rubber ring the battery is placed on. The two halves should be pressed together until you hear a click.How to reset the system’s Keyless Entry SystemThe key fob that you have in your Mazda 3 is not only a convenience, it’s also an important security feature. The car won’t start if the key is lost or stolen, even if you’ve got a spare fob. This is because the fob that you have to be reset at the dealership to work properly. This can be a painful and costly ordeal. So, it’s best to understand how you can reset the system.Disconnect the battery from the system for 15 minutes. This will eliminate any residual power from the on-board computer. The next step is to 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 set the ignition to ON. Stop the ignition after approximately five minutes. The key’s information has been stored in the car’s computer and the new fob will 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 getting access to your car. You can purchase a new keyfob online, but it must be programmed and cut by an authorized dealer.