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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea always to keep an extra key on hand no matter if you've dropped your keyfob, or it stopped working. This article will go over everything you need to be aware of when changing, adding, and reprogramming your Mazda 3 key fobs. A word of warning Some keys require programming by a professional locksmith or dealer, while other keys do not. Make sure you only use genuine Mazda replacements for your key fob. How to Add a Spare Key You can add a second key if you don't have a spare key, or when you accidentally damage your existing one. To do this, you'll need an incredibly small screwdriver, a flathead screwdriver, and an updated CR2025 battery. Once mazda key fob replacement near me got these tools and are ready to access the key fob and replace the battery. Find the key release auxiliary. It's located underneath the metal piece and is easy to find. Once you press the button, the cover will fall off instantly. Then, put the screwdriver's tip into the notch at the top or into the space and remove the metal part. Insert the spare or new key into the slot after taking out the auxiliary key. Set the ignition to ON, and wait for about 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. You don't want to use more than two keys to start your car. This is a safeguard to stop unauthorized users from activating your key fobs and starting your car. How to Reprogram a Spare Key It's a good idea to be aware of how to reprogram a spare key in the event that the original key is lost or stolen. This will keep unauthorized people from stealing your car and starting it. This should work with any Mazda. You will require two keys that work to begin the reprogramming. If you don't have two keys that function it's recommended to take your vehicle to a dealer to get this completed. Start by stepping into driver's position and shutting all doors, with the exception of the one that is open. Set the ignition to ON and then insert the first working key. Wait five seconds before removing the key. Repeat with the second key. Once you've programmed your new key, you should have three working keys you can use to start your vehicle in the future. Check each key to make sure they're working correctly before putting them away. You should think about buying an extra Mazda 3 remote, especially in cases where your car is prone to issues. You can purchase one online or in your local auto store. Make sure you look up reviews before you purchase to ensure that you don't purchase an item that isn't compatible with your vehicle. How to change the battery on a spare key? There's nothing worse than discovering that the battery for your key fob has failed and you are unable to unlock your vehicle. It's easy to replace the battery yourself and save money at the dealer. Press the auxiliary key button at the back of the keyfob. This will take out the metal key auxiliary to reveal two slots on the sides of the case. Press the flathead into one of these slots and then gently push the two halves apart. Once the battery is fully exposed, take it out and place the case somewhere safe from being lost. Be sure to have a replacement battery prior to starting. You can find these at any store that stocks batteries or at a Mazda dealer close to Winter Garden. Choosing the correct battery will ensure that your key fob operates correctly. Replace the cap on the battery, and then replace the battery. Be careful not to damage the small rubber ring that the battery rests on. Finally, press the two parts of the key fob together until you hear a click. How to Reset the system's Keyless Entry System The Mazda 3 key fob is not just a convenience. It's also an element of security. The car will not start if your key is lost or stolen, even if you've got a spare fob. This is because the key fob needs to be reset at the dealership in order to work properly. It can be a stressful and expensive ordeal. Therefore, it's best to learn how to reset the system. Disconnect the battery from the system for 15 minutes. This will remove any remaining electric current from the onboard computer. Then, disconnect the LF ECU and demand switch connectors. Verify the continuity between the next terminals. Place the key in the slot and switch the ignition on. Switch off the ignition after approximately five minutes. The key's information has been added to the vehicle's computer and the new fob will start your car. You can program up to three fobs, however, you should only use one at a time. This will stop unauthorized individuals from stealing your key and gaining access to your car. You can purchase a brand new key fob online, however you'll still need to visit a dealer or locksmith to get it cut and programmed.