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How to Add, Change, and Reprogram a Mazda 3 Spare Key If you've dropped your key fob on the ground or it has stopped working, it's always best to have a spare key on hand. This article will teach you how to add, alter or reprogramme your Mazda 3 keyfobs. A word of warning Certain keys require programming by a locksmith professional or dealer, while others don't. Be sure to only make use of official Mazda replacements for your key fob. How to add a spare key You can also add another key in the event that you don't have a spare key or in the event that you break the one you already have. You'll need to use a flathead screwdriver, and a CR2025 new battery. Once you've got these items then it's time to open the key fob. Find the auxiliary key release. The button is on the bottom of the metal portion. It's easy to find. When you hit the button, the cover should fall off right away. Then, place the screwdriver head into the notch on top or into the space and take the metal part away. Insert your new or spare key into the slot after removing the auxiliary key. Turn on the ignition and wait for about five seconds before turning it to off. This will allow the system to recognize the new key and begin your vehicle in the future. It is only possible to program three keys on your Mazda 3. You don't want to utilize more than two key fobs in order to start your vehicle. battery for mazda 2 key is a security measure designed to prevent unauthorised users, such as valet drivers who are not authorized to use your key and starting your car. How to Reprogram a spare key It's a smart idea to know how to reprogram an extra key in the event that your original key is lost or stolen. This will prevent unauthorized people from starting your car or taking it. This procedure should work with any Mazda however, you'll require two keys working to begin the process of reprogramming. If you don't have the two working keys, you'll need to take your vehicle to a dealership to have it done. Start by getting into the driver's position, and close all the doors, except the one that is open. Turn the ignition on and insert the first functioning key. Wait five seconds, then remove the key and repeat with the second working key. After you've programmed your new key, you should have three working keys that you can use to start your vehicle in the future. Before you store each key, make sure it's working properly. You should think about buying a spare Mazda 3 remote, especially if your car is prone to issues. You can purchase one on the internet or at a local automotive store. Make sure you review the reviews before buying so that you don't get the wrong key fob that isn't compatible with your vehicle. How do I change the battery on a spare key It's awful to discover that your key fob has failed, and you are locked out of your vehicle. It's easy to change the battery yourself and save money at the dealer. Press the auxiliary key button at the back of the keyfob. This will release the metal key and reveal a slot on each side of the case. Press the flathead into one of these slots, and then gently pull the two halves apart. After the battery is fully exposed, remove the case and put it in a spot where you'll never forget about it. Before you start, make sure that you have a brand new replacement battery. They are available in any store that sells batteries or at a Mazda dealer close to Winter Garden. Choosing the right battery will ensure that your key fob works properly. Next, put the new battery in its place and then replace the cap on the battery. Be careful not to damage the small rubber ring that the battery sits on. Press the two halves together until you hear a click. How to reset the system's Keyless Entry System The Mazda 3 key fob is not just a convenient feature. It also serves as an element of security. The car will not start if the key is stolen or lost, even if you've got a spare key fob. This is because the fob that you have to be reprogrammed at the dealership in order to work properly. It can be a stressful and costly process. Therefore, it's advisable to learn how you can reset the system. Disconnect the battery from the system for 15 minutes. This will erase any residual electricity 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: Place the key in the slot, then switch the ignition on. Turn off the ignition after about five seconds. The information from the key will be added to the vehicle's computer and the new fob will be able start your car in the future. You can program up to three fobs however, you must only use one at a time. This will prevent unauthorized persons from copying the key and getting ahold of your vehicle. You can purchase a new keyfob online, however it still needs to be programmed and cut by a dealer.