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How to Add, mazda 6 key , and Reprogram a Mazda 3 Spare Key It's a good idea to have an extra key in your pocket regardless of whether you lost the keyfob you were using or it has stopped working. This article will go over everything you must be aware of when changing, adding, and changing the programming of your Mazda 3 key fobs. Warning: Some keys require programming from an expert locksmith, while others don't. Be sure to only use genuine Mazda replacements for your key fob. How do I add a spare key If you're not fortunate enough to receive a spare keys from the dealership when you buy your Mazda 3 or accidentally break your current key, don't worry — there's an option to make another key. You'll need an flat-head screwdriver and the CR2025 replacement battery. Once you've got the tools you can access the key fob and replace the battery. Locate the auxiliary key release. It's located under the metal portion and is easy to locate. The cover that covers the back should come off the moment you press the button. Then, insert the screwdriver's head into the notch on top or the space, and pry the metal part off. Insert your new or spare key into the slot after you have removed the auxiliary key. Set the ignition to ON and wait for five seconds before turning it to OFF. This will add the new information on the key to the system and allow it to start your car in the future. It is only possible to program three keys on your Mazda 3. You don't want to utilize more than two keys to start your vehicle. This is a precautionary measure to stop anyone who is not authorized from activating your keys and then starting your vehicle. How do I reprogram an unrepaired key It's a smart idea to know how you can reprogram an extra key in the event that your original key is lost or stolen. This will prevent unauthorized people from opening your car or stealing it. This process should work on any Mazda however you'll need two working keys to start the process of reprogramming. If you don't have two keys that work it's recommended to take your Mazda to a dealer to get this done. Start by stepping into driver's seat and close all the doors, except the one that is open. Insert the first working key in the slot, and then set the ignition to ON. After five seconds, take the key out and repeat with the second working key. After you've programmed your new key, you should have 3 keys that work to start your vehicle in the future. Before saving each key, be sure that it's functioning properly. You should think about purchasing an extra Mazda 3 remote, especially when your car is susceptible to issues. You can find one online or at a local automotive store, but be sure to read reviews prior to purchasing so you can avoid getting a key fob that's not compatible with your car. How do I change the battery on a spare Key It's awful to discover that your key fob is dead, and you are unable to unlock your vehicle. Fortunately, it's easy to replace the battery and save yourself some cash at the dealership. The first step is to press the auxiliary button on the back of the key fob. This will take out the key's metal cover and reveal the slots on both sides of the case. Put the flathead into one of these slots and gently pry the two halves of the case apart. Once the battery is fully exposed, take it out and place it in a safe place in a place where you will not forget it. Before you begin, be sure you have a brand new replacement battery. You can find these at any store that stocks batteries or at a Mazda dealer near Winter Garden. Using the right type of battery will ensure that your key fob works effectively. Replace the cap on the battery, and then install the new battery. Be careful not to scratch the small rubber ring that the battery is placed on. Then, press the two halves of the key fob until you hear a click. How do you reset the Keyless Entry System The key fob in your Mazda 3 is not only an extra convenience, but also an important security feature. If you lose your key, or have it stolen the car will not start even if you've got the spare fob. The key fob has to be reprogrammed by a dealer to allow it to work again. It can be a stressful and costly experience. Therefore, it's recommended to learn how to reset the system. Disconnect the battery from the system for 15 minutes. This will clear any residual electric current from the onboard computer. Next, disconnect both the LF-ECU connector and the demand switch connectors. Verify the continuity between the next terminals. Insert the key into the slot, and switch on the ignition. Switch off the ignition after approximately five seconds. The key's details will be saved to your car's computer and the new fob will be able start your car in the future. You can program as many fobs you want however only one should be used at a particular time. This will prevent unauthorised people from stealing your key and gaining access to your vehicle. You can purchase a new keyfob from the internet, however it will still need to be cut and programmed by a dealer.