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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea always to have an extra key in your pocket, whether you dropped the keyfob or it stopped working. This article will go over everything you must be aware of when the process of adding, changing, and changing your Mazda 3 key fobs. Warning: Some keys require programming by an experienced locksmith, whereas others do not. Make sure you use only official Mazda replacements to replace your key fob. How do I add a spare key? If you're not lucky enough to receive a spare key from the dealership when you buy your Mazda 3 or accidentally break your current key Don't fret, there's an option to get another key. You'll need an flat-head screwdriver and an CR2025 battery. Once mazda key replacement near me have the items then it's time to open the key fob. Locate the auxiliary key release. The button is on the bottom of the metal portion. It's easy to find. The back cover should come off when you press the button. Next, insert the head of the screwdriver into the notch or spacing at the top of the metal part and pull it off. Insert your spare key or a new one into the slot after taking out the accessory key. Set the ignition to 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 into your Mazda 3. The one thing you don't want is to have more than two functioning key fobs and not be in a position to get your car started. This is a security measure that is designed to block unauthorized users, like valet drivers who are not authorized to use your key and starting your car. How to Reprogram a spare key It's smart to be aware of how to reprogram a spare key in the event that your original key gets lost or stolen. This will stop unauthorized persons from starting your car or stealing it. This process is compatible with any Mazda, though you'll need two working keys to begin the reprogramming process. If you don't own 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, except for the one that's open. Put the first working key in the slot, and then turn the ignition to the ON position. Take five seconds before removing the key. Repeat with the second key. After programming your new key, you should have three keys that work to start your car in the near future. Test each key to make sure that they're functioning properly before taking them off. It's a good idea to purchase an extra Mazda 3 key fob, especially if you're a driver who frequently loses their key or has other issues with it. You can buy one online or at your local auto store. Make sure you read reviews before purchasing to ensure that you don't get a key fob which isn't compatible with your car. How do I change the battery on a spare Key There's nothing more frustrating than discovering that the battery on your key fob gone out and you're not able to unlock your car. It's not a problem to replace the battery and save yourself some money at the dealer. Press the auxiliary button on the back of the keyfob. This will remove the key's metal cover and reveal a slot on each side 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 completely exposed, remove it and put it away somewhere safe from being lost. Before you begin, be sure that you have a new replacement battery. You can find these in any store that sells batteries or at an Mazda dealer near Winter Garden. Using the correct type of battery will ensure that your key fob operates correctly. Then, place the new battery in its place and then replace the battery cap. 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 an audible click. How do I reset a Keyless Entry System The key fob inside your Mazda 3 is not only an added convenience, but it's also an important security feature. If you lost your key or had it stolen, the car will not start even if it has the spare fob. The key fob needs to be reprogrammed by the dealer to allow it to work again. It's a difficult and costly process. Therefore, it's advisable to know how to reset the system. Disconnect the battery from the system for 15 minutes. This will remove any residual electrical power in the on-board computer. Then, disconnect both the LF-ECU connector as well as the demand switch connectors. Verify that the connections are in good order between the terminals. Put the key in the slot, and switch the ignition on. Keep the key in place for about five seconds and then switch off. The key information will now be saved to your car's computer, and the new fob will be able to start your vehicle in the future. You can program as many fobs you would like however only one must be utilized at any particular time. This stops unauthorized individuals from copying your key and gaining access to your car. You can purchase a new key fob on the internet, but you'll still have to visit a locksmith or dealer in order to cut it and programmed.