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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 at hand regardless of whether you lost your keyfob, or it stopped working. This article will teach you how to add, modify or reprogramme the Mazda 3 keyfobs. Certain keys require programming from a professional locksmith, while others do not. Only use authentic Mazda replacements to replace your key fob. How do I add an additional key You can add an additional key in case you don't have a spare key or when you accidentally damage your existing one. You'll need a flathead screwdriver, and the CR2025 replacement battery. Once you've got all the equipment, it is time to open the key fob. Find the key release auxiliary. It's on the underside of the metal piece and is easy to locate. Once you hit the button, the cover will fall off instantly. Then, place the screwdriver head into the notch on top or the space, and pull the metal piece off. After the auxiliary keys are removed, insert your new or spare key into the slot. Turn the ignition on and wait for about five seconds, and then turn it to OFF. This will add the new key's information to the system, allowing it to start your car in the future. You can only program three keys into your Mazda 3. The most important thing is to have more than two working key fobs and not be in a position to get your car started. This is a security measure to prevent unauthorized users from activating your keys and then starting your vehicle. How to Reprogram a Spare Key If you have a spare key, it's best to know how to program it if 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 begin the reprogramming. If you don't own two keys that work, you should take your Mazda to a dealer to have this completed. Begin by getting into your driver's seat and close the door, with the exception for the one that's opened. Set the ignition to ON and insert the first working key. Take five seconds before removing the key. Repeat with the second key. After you finish programming your new key you should have three keys that will be able to start your vehicle in the future. Test each key to make sure that they're functioning properly before throwing them away. It's a good idea to buy a spare Mazda 3 key fob, particularly if you're a driver who often loses your key or has other issues with it. You can purchase one online or in your local automotive store. Be sure to look up reviews before you purchase to ensure that you don't purchase one that's not compatible with your car. How to 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 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 that is located on the back of the key fob. This will take out the metal key that is used as an auxiliary key, and expose an opening on both sides of the case. Use the screwdriver's flathead to push it into one of these slots. Then, gently take apart the two parts of the case. When the battery is completely exposed, take it out and place the case in a place where you will not forget it. Before you begin, make sure you have a new replacement battery. You can purchase them at any retailer that sells batteries or at an Mazda dealer close to Winter Garden. Using the right type of battery will ensure that your key fob operates correctly. Next, put the new battery in the correct place and replace the cap on the battery. Be careful not to damage the small rubber ring that the battery rests on. Then, press the two parts of the key fob together until you hear the sound of a click. How can I reset the Keyless Entry System The key fob inside your Mazda 3 is not only an added convenience, but it's also an important security feature. If mazda 2 spare key lost your key or had it stolen the car will not start even if you have the spare fob. The key fob has to be reset by the dealer to make it work again. It can be a frustrating and costly process. Therefore, it's recommended to learn how you can reset the system. To reset the system, remove the battery for about 15 minutes. This will eliminate any residual electric current from the onboard computer. Then, disconnect both LF-ECU and demand switch connectors. Verify that the connections are in good order between the terminals. To program an entirely new key or spare, insert it into the slot and turn the ignition to ON. The ignition should be turned off after about five minutes. The key's details are now added to the vehicle's computer and the new fob can start your vehicle. You can program up to three fobs, however, you should only use one at a time. This will prevent unauthorized people from stealing your keys and getting access to your car. You can purchase a replacement key fob on the internet, but you'll still need to go to an authorized locksmith or dealer to have it cut and programmed.