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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 stopped working, it's an excellent idea to keep an extra key available. This article will go over everything you need to learn about adding, changing, or changing the programming of your Mazda 3 key fobs.Be aware that some keys require programming from professional locksmiths, 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 receive a spare key from the dealer when you buy your Mazda 3 or accidentally break your current key, don't worry -- there's the option of adding another key. To do this, you'll need an inexpensive flathead screwdriver as well as a new CR2025 battery. Once you've got these items you can remove the key fob and swap the battery. First, locate the auxiliary key release button. It's located on the underside the metal part. It's easy to find. Once you hit the button, the cover will fall off instantly. Next, insert the head of the screwdriver into the notch or space on the top of the metal piece and pull it away.Insert your spare or new key into the slot after removing the auxiliary key. Turn on the ignition and then wait for around five seconds, then set it to OFF. This will add the new key's information to the system that will allow it to start your car in the future.You can only program three keys on your Mazda 3. The one thing you don't want is to have more than two functioning key fobs and not be capable of getting your vehicle started. This is a safety precaution designed to prevent unauthorised users, such as valet drivers who are not authorized to use your key and starting your vehicle.How to Reprogram a spare keyIt's smart to know how to reprogram an extra key in the event that the original key is lost or stolen. This will stop unauthorised people from opening your car or stealing it. This process is compatible with any Mazda, though you'll need two keys that work to begin the process of reprogramming. If you don't have two keys that work it's recommended to take your car to a dealer to have this completed.Start by getting into the driver's position and closing all the doors except the one that is open. Place the working key in the slot, and 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.Once you've finished programming your new key, you should have three working keys you can use to start your car in the future. Check each key to make sure they're working correctly before placing them away.It's a good idea purchase an extra Mazda 3 key fob, especially if your car is one who frequently loses their key or has other issues with it. It's possible to find one on the internet or at a local automotive retailer, but make sure to read the reviews before purchasing so that you can avoid purchasing the wrong key fob compatible with your vehicle.How to change mazda 6 key fob replacement on a spare keyIt's a nightmare to discover that the key fob you used to use has gone out and you're in a position to not unlock your car. It's a good thing that it's simple to replace the battery and save yourself some cash at the dealership.Press the auxiliary key button at the back of the keyfob. This will release the metal key that is used as an auxiliary key, and expose slots on both sides of the case. Use the screwdriver's flathead to push it into one of these slots and gently take apart the two sides of the case. When the battery is fully exposed, remove the case and place it somewhere that you will not forget it.Before you begin, make sure that you have a brand new replacement battery. They can be found at any store that stocks batteries or at a Mazda dealer near Winter Garden. The correct battery is essential to ensure that your keyfob works properly.Then, place the new battery into place and replace the cap on the battery. Be careful not damage the rubber ring on which the battery rests. Finally, press the two parts of the key fob together until you hear the sound of a click.How to Reset the Keyless Entry SystemThe key fob that you have in your Mazda 3 is not only a convenience, it's also an important security feature. If you lost your key or had it stolen the car won't start even if you've got the spare key fob. This is because the key fob needs to be reset at the dealership to work properly. This could be a costly and frustrating ordeal therefore it's a great idea to know how to reset the system yourself.To reset the system, disconnect the battery for approximately 15 minutes. This will erase any residual electricity in the on-board computer. Then, disconnect both LF-ECU connector as well as the demand switch connectors. Then, check continuity between the following terminals:Place the key into the slot and turn on the ignition. Leave the key in for about five seconds and then turn it off. The key information is now added to the computer in your car and the new fob can start your car. You can program up to three fobs, but you must only use one at each time. This will stop unauthorized individuals from stealing your keys and getting access to your vehicle. You can purchase a brand new key fob on the internet, but you'll still have to visit an authorized locksmith or dealer to cut it and programmed.