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How to Add, Change, and Reprogram a Mazda 3 Spare Key Whether you dropped your key fob on the ground or it just stopped working, it's always recommended to keep a spare key handy. This article will explain everything you should know about changing, adding, and programming your Mazda 3 key fobs. Certain keys require programming by an expert locksmith, while others do not. Use only authentic Mazda replacements to replace your key fob. How to add an extra key If you're unable to find a spare key from the dealer when you buy your Mazda 3 or accidentally break your current key do not fret — there is still a way to add another key. To do this, you'll need an incredibly small screwdriver, a flathead screwdriver, and an updated CR2025 battery. Once you've got the tools, it's time to remove the key fob and change the battery. First look for the key release button for the auxiliary key. It's located on the underside the metal part. It's easy to locate. The cover that covers the back should come off when you press the button. Then, insert mazda replacement key into the notch or space on the top of the metal piece and pull it off. After the auxiliary keys are removed, insert your new or spare key into the slot. Switch the ignition on and wait for approximately five seconds, then turn it to OFF. This will add the new key's information into the system which will allow it to start your car in the future. It is important to remember that you can only program up to three keys on your Mazda 3. The last thing you want is to have more than two working key fobs but not be in a position to get your vehicle started. This is a safety measure designed to stop unauthorized users, such as valet drivers from activating your key and starting your vehicle. How to Reprogram a spare key If you have a spare key, it's important to be aware of how to reprogram it in case your original key is stolen or lost. This will stop unauthorized persons from opening your car or taking it. This process is compatible with any Mazda but you'll need two working keys to start the process of reprogramming. If you don't have two keys that work, it's best to take your vehicle to a dealer to have this done. Start by stepping into driver's seat 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. Then wait five seconds before taking out the key. Repeat with the second key. Once you've programmed your new key, you'll have three working keys you can use to start your vehicle in the future. Before storing each key, make sure it's functioning correctly. You should think about buying a spare Mazda 3 remote, especially in the event that your vehicle is prone to issues. You can buy one online or at your local auto store, but be sure to read the reviews prior to purchasing so you aren't purchasing the wrong key fob compatible with your car. How do you change the battery on a spare key? It's a nightmare to discover that your key fob has died and you're locked out of your vehicle. It's simple to replace the battery yourself and save money at the dealership. Press the auxiliary key button on the back of the keyfob. This will remove the metal key auxiliary to reveal two slots on the sides of the case. Use the screwdriver's flathead to push it into one of these slots, and gently pry apart the two sides of the case. Once the battery is fully exposed, take it out and place the case in a place where you will not forget it. Before you begin, be sure that you have a new replacement battery. They can be bought from any store that sells batteries or from a Mazda dealer in Winter Garden. Using the correct type of battery will ensure that your key fob operates effectively. Replace the battery cap and then put in the new battery. Be careful not to damage the small rubber ring the battery is placed on. Finally press the two halves of the key fob together until you hear the sound of a click. How can I reset the Keyless Entry System The Mazda 3 key fob is not just a convenient feature. It's also an important security feature. If you lose your key or have it stolen the car won't start even if you've got the spare fob. This is because the fob that you have to be reprogrammed at the dealership to work properly. It can be a frustrating and costly ordeal. Therefore, it's recommended to understand how you can reset the system. To reset the system, unplug the battery for approximately 15 minutes. This will take out any remaining electrical current from the computer on board. Then, disconnect the LF-ECU and demand switch connectors. Then, verify the continuity between the following terminals: Put the key in the slot, and switch on the ignition. Stop the ignition after about five minutes. The key information is now added to the vehicle's computer and the new fob is able to start your vehicle. You can program up to three fobs, but you should only use one at one time. This will prevent unauthorized persons from copying your key and gaining access to your vehicle. You can purchase a brand new keyfob online, but it still needs to be cut and programmed by an authorized dealer.