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How to Add, Change, and Reprogram a Mazda 3 Spare KeyIt's a good idea always to have an extra key in your pocket, whether you dropped your keyfob, or it was unable to function. This article will explain everything you should be aware of changing, adding, and reprogramming your Mazda 3 key fobs.Certain keys require programming from professional locksmiths, while others do not. Make sure you use only authentic Mazda replacements to replace your key fob.How to add an extra keyYou can add an additional key in case you don't have a spare key, or if you accidentally break the one you have. To do this, you'll need an incredibly small screwdriver, a flathead screwdriver, and an updated CR2025 battery. Once you've got all the equipment you need, it's time to open the key fob. Find the key release auxiliary. It's located underneath the metal part and is easy to find. The back cover should come off the moment you press the button. Next, place the head of the screwdriver into the notch or the space at the top of the metal component and then pull it off.Insert your new or spare key into the slot after removing the additional key. Set the ignition ON and wait for five seconds before turning it to OFF. This will allow the system to recognize the new key and start your vehicle in the future.It is only possible to program three keys in your Mazda 3. You don't want to have to use more than two key fobs in order to start your vehicle. This is a safety measure to stop unauthorised users from activating your key fobs and starting your vehicle.How to reprogram an unrepaired key?It's smart to be aware of how to reprogram a spare key in the event that the original key is lost or stolen. This will keep unauthorised persons from starting your car or taking it. This process is compatible with any Mazda, though you'll need two working keys to begin the reprogramming process. If you don't have two functioning keys, you'll have to take your vehicle to the dealership to complete the process.Start by getting into the driver's seat and shutting all doors, with the exception of the one that is open. Turn the ignition on and insert the first functioning key. Wait for five seconds, then take the key out and repeat with the second working key.Once you've programmed your new key, you should have three keys that you can use to start your vehicle 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, particularly if you're a driver who frequently loses their key or has other issues with it. You can buy one online or in your local auto store. Be sure to read reviews before purchasing so that you don't get an item that isn't compatible with your car.How to change the battery on a spare keyThere's nothing more frustrating than finding that the battery for your key fob has failed and you are unable to unlock your car. It's not a problem 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 release the metal key auxiliary to reveal an opening on both sides of the case. Insert the flathead screwdriver into one of these slots and then gently pry apart the two sides of the case. When the battery is completely exposed, remove it and place the case somewhere safe from being lost.Before you start, make sure you have a brand new replacement battery. You can purchase them in any store that sells batteries or at a Mazda dealer close to Winter Garden. The correct type of battery is vital to ensure that your keyfob is working correctly.Then, put the new battery in the correct place and replace the cap on the battery. Be careful not to damage the small rubber ring that the battery is placed on. Press the two halves together until you can hear the click.How do I reset a Keyless Entry SystemThe Mazda 3 key fob is not just a convenience. mazda replacement keys serves as a security measure. The car will not start if your key is stolen or lost, even if you've got a spare fob. This is because the fob that you have to be reprogrammed at the dealership to function properly. It's a difficult and costly process. Therefore, it's recommended to understand how you can reset the system.To reset the system, remove the battery for 15 minutes. This will remove any residual electrical power in the on-board computer. The next step is to disconnect the LF-ECU and demand switch connectors. Check for continuity between the following terminals:Put the key in the slot, and switch on the ignition. Keep the key in place for about five seconds, then turn it off. The key's details will be saved to your car's computer, and the new fob will be able to start your vehicle in the future. You can program up to three fobs, however, you must only use one at one time. This will prevent unauthorized people from stealing your key and getting access to your vehicle. You can purchase a replacement keyfob online, but it'll still need to be programmed and cut by an authorized dealer.