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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea to have an extra key at hand regardless of whether you lost the keyfob you were using or it was unable to function. This article will explain everything you must be aware of the process of adding, changing, and programming your Mazda 3 key fobs. Certain keys require programming from a professional locksmith, while others do not. Be sure to only make use of official Mazda replacements for your key fob. How do I add a spare key? You can also add an additional key if you don't have a spare key, or if you accidentally damage your current one. You'll need an flat-head screwdriver and a CR2025 new battery. Once you've got these items, it is time to open the key fob. Find the auxiliary key release. The button is beneath the metal portion. It's easy to locate. When you hit the button, the back cover should slide off immediately. Next, place the head of the screwdriver into the notch, or the spacing at 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. Turn the ignition on and wait for approximately five seconds, and then turn it to OFF. This will allow the system to recognize the new key and begin your vehicle in the future. You can only program three keys to your Mazda 3. You don't want to use more than two key fobs in order to start your car. This is a safety measure designed to prevent unauthorised users, like valet drivers from activating your key and starting your vehicle. How do I reprogram a spare key? If you have a spare key it's a good idea be aware of how to reprogram it in case your original key is stolen or lost. This will stop unauthorised people from starting your vehicle or stealing it. This procedure should work with any Mazda however, you'll require two working keys to start the process of reprogramming. If you don't have the two working keys, you'll need to bring your vehicle to the dealership to have it done. Begin by getting into your driver's seat, and close the door, except for the one that's already opened. Set the ignition to ON and insert the first functioning key. After five seconds, remove the key. Repeat the process 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. Test each key to ensure sure that they're working properly before placing them away. It's a good idea to purchase a spare Mazda 3 key fob, particularly if you're a driver who has a tendency to lose their keys or has other issues with it. You can find one online or at your local automobile store, but make sure to read the reviews prior to purchasing so you aren't buying the wrong key fob compatible with your vehicle. How do I change the battery on a spare key It's depressing to find out that your key fob has failed, and you are not able to unlock your car. It's simple to replace the battery yourself and save money at the dealership. The first step is to press the auxiliary key button on the back of the key fob. This will remove the key auxiliary and reveal slots on both sides of the case. Use the screwdriver's flathead to push it into one of these slots, and gently remove the two sides of the case. After the battery is fully exposed, remove the case and put it in a place where you won't forget it. Before you start, make sure you have a new replacement battery. These batteries can be purchased at any retailer that sells batteries or from a Mazda dealer in Winter Garden. Choosing the right battery will ensure that your key fob is working properly. Replace the cap of the battery and then put in the new battery. Be careful not damage the rubber ring that holds the battery. Finally, press the two halves of the key fob together until you hear a click. How to reset a Keyless Entry System The Mazda 3 key fob is not just a practical feature. It also serves as a security measure. If you lost your key or had it stolen the car won't start, even if you have the spare key fob. The key fob should be reprogrammed by the dealer to enable it to function again. This can be a costly and stressful experience It's a good idea to know how to reset the system yourself. Disconnect the battery from the system for 15 minutes. This will eliminate any remaining power from the on-board computer. Then, disconnect the LF -ECU and demand switch connectors. Check for continuity between the following terminals: Place the key into the slot, then switch on the ignition. Turn off the ignition after approximately five seconds. mazda 2 key replacement are now added to the vehicle's computer and the new fob can start your car. You can program any number of fobs you want however only one should be in use at any specific time. This will stop unauthorized individuals from stealing your keys and getting access to your car. You can buy a new keyfob online, however it'll still need to be programmed and cut by a dealer.