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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 a good idea to have an extra key in your pocket. This article will tell you how to add, change or reprogramme your Mazda 3 keyfobs. Warning: Some keys require programming by a professional locksmith, while others don't. Make sure you only use official Mazda replacements for your key fob. How do I add a spare key? If you're not lucky enough to find a spare key from the dealer when you purchase your Mazda 3 or accidentally break the one you have do not fret — there's still a way to add another key. To do this, you'll need a small screwdriver with a flat head and a new CR2025 battery. Once you've got these items then it's time to access the key fob and change the battery. Find the auxiliary key release. The button is located on the bottom of the metal portion. It's easy to find. The cover that covers the back should come off as soon as you press the button. Then, insert the screwdriver's tip into the notch at the top or in the space, and take the metal part away. After the auxiliary keys are removed, insert your new or spare key into the slot. Set the ignition to ON, and wait about five seconds before setting it to OFF. This will add the new information on the key to the system and allow it to start your vehicle in the future. It's important to know that you can only program up to three keys for your Mazda 3. You don't want to use more than two keys to start your vehicle. This is a safety precaution that is designed to block unauthorized users, such as valet drivers from activating your key and thereby starting your car. How to Reprogram a spare key It's a good idea to learn how you can reprogram an extra key in the event that your original key gets lost or stolen. This will stop unauthorized persons from getting into your car and causing damage to it. This procedure should work with any Mazda, though you'll need two keys that work to begin the reprogramming. If you don't own two working keys, you'll need to take your vehicle to the dealership to get it done. Begin by getting in mazda 3 spare key and closing the door, except for the one that's open. Turn the ignition on and insert the initial working key. Wait five seconds before removing the key. Repeat with the second key. After programming your new key, you should have three keys that allow you to start your vehicle in the future. Before you store each key, make sure it's functioning correctly. It's a good idea to purchase an extra Mazda 3 key fob, especially if you're a driver who has a tendency to lose their keys or has other issues with it. You can purchase one online or at your local automobile store, but be sure to read the reviews prior to purchasing so you can avoid purchasing one that's not compatible with your vehicle. How to change the battery using a spare key It's awful to discover that your key fob is dead, and you are not able to unlock your car. It's simple to replace the battery yourself and save money at the dealer. The first step is to press the auxiliary key button located on the back of the key fob. This will remove the metal auxiliary key and expose two slots on the sides of the case. Insert the flathead screwdriver into one of these slots and then gently pry apart the two sides of the case. Once the battery is fully exposed, remove it and put it away somewhere safe from being lost. Be sure to have an additional battery prior to beginning. You can find these in any store that sells batteries or at a Mazda dealer near Winter Garden. Using the right type of battery will ensure that your key fob is working perfectly. Replace the battery cap and then replace the battery. Be careful not to damage the rubber ring on which the battery rests. The two halves should be pressed together until you hear the click. How do I reset the system's Keyless Entry System The Mazda 3 key fob is not just a practical feature. It also serves as an element of security. If you lose your key or have it stolen the car will not start even if you've got the spare key fob. This is because the key fob needs to be reset at the dealership in order to work once more. It can be a costly and stressful experience and it's a good idea to learn how to reset the system yourself. Remove the battery from the system for 15 minutes. This will clear any residual electricity from the on-board computer. Then, disconnect the LF -ECU and demand switch connectors. Check continuity between the following terminals. Place the key into the slot, and turn on the ignition. Turn off the ignition after approximately five minutes. The key's information is transferred to the computer of your vehicle and the new fob will start your car. You can program any number of fobs you desire however only one must be utilized at any particular time. This will keep unauthorised individuals from stealing your key and getting access to your vehicle. You can purchase a new keyfob online, but it must be cut and programmed by a dealer.