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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 on hand in case you lose your keyfob, or it stopped working. This article will go over everything you must learn about the process of adding, changing, and reprogramming your Mazda 3 key fobs. Be aware that some keys require programming by an expert locksmith, while others don't. Make sure to make use of official Mazda replacements for your key fob. How to add an additional key If you're not lucky enough to receive a spare key from the dealership when you buy your Mazda 3 or accidentally break the one you have, don't worry — there's still a way to add another key. To do this, you'll need a small flathead screwdriver and the new CR2025 batteries. Once you've got these tools, it's time to open up the key fob to change the battery. Find the auxiliary key release. It's located under the metal piece and is easy to find. The back cover should slide off the moment you press the button. Next, insert the screwdriver's head into the notch or spacing at the top of the metal component and pull it off. After the auxiliary key has been removed, insert the new or spare key into the slot. Switch the ignition on and then wait for around five seconds, then set it to OFF. This will register the new key's information into the system, allowing it to start your vehicle in the future. It's important to know that you can only program up to three keys on your Mazda 3. The final thing you want is to have more than two working key fobs and not being capable of getting your vehicle started. This is a safety measure designed to prevent unauthorised users, like valet drivers who are not authorized to use your key and starting your vehicle. How to Reprogram a spare key It's a smart idea to be aware of how to reprogram an extra key in the event that the original key is lost or stolen. This will keep unauthorised persons from opening your car or taking it. This will work with any Mazda. battery for mazda 2 key 'll need two keys that are working for the reprogramming to begin. If you don't own two working keys, you'll need to bring your vehicle to the dealership to complete the process. Begin by putting yourself in the driver's seat and close the door, except for the one that's opened. Place the first working key in the slot, then turn the ignition to the ON position. Then wait five seconds before taking out the key. Repeat with the second key. After you finish programming your new key you should have three keys that be able to start your car in the future. Before placing each key in storage, make sure that it's functioning properly. You should consider buying a spare Mazda 3 remote, especially in cases where your car is prone to problems. You can buy one online or at your local auto store. Make sure you read reviews before purchasing so that you don't get the wrong key fob that isn't compatible with your vehicle. How to change the Battery on a Spare Key It's awful to discover that your key fob is dead and you're in a position to not unlock your car. 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 take out the metal key auxiliary and reveal two slots on the sides of the case. Use the screwdriver's flathead to push it into one of these slots and then gently break the two halves of the case. Once the battery is fully exposed, remove the case and put it in a place where you won't forget about it. Before you start, make sure that you have a new replacement battery. They can be found at any retailer that sells batteries or at an Mazda dealer close to Winter Garden. The correct type of battery is essential to ensure that your keyfob works correctly. Next, put the new battery in place and 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 can hear the click. How to Reset the Keyless Entry System The key fob that you have in your Mazda 3 is not only an option for convenience, it's an important security feature. If you lose your key or had it stolen the car won't start, even if you have the spare key fob. This is because the key fob has to be reprogrammed by the dealership in order to work once more. This can be a painful and costly experience. So, it's best to learn how to reset the system. To reset the system, remove the battery for approximately 15 minutes. This will eliminate any remaining electric current from the onboard computer. Then, disconnect both the connectors for the LF-ECU and the demand switch connectors. Then, check continuity between the following terminals: To program an entirely new key or spare, insert it into the slot and set the ignition to ON. Turn off the ignition after about five seconds. The information from the key will be added to your 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 each time. This will prevent unauthorized people from stealing your key and getting access to your vehicle. You can purchase a replacement key fob on the internet, but you'll still have to visit an expert locksmith or dealer to have it cut and programmed.