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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea to keep an extra key at hand regardless of whether you lost the keyfob or it stopped working. This article will explain how to add, modify or reprogramme the Mazda 3 keyfobs. A word of caution Some keys require programming by a professional locksmith or dealer, while other keys don't. Make sure you only use official Mazda replacements for your key fob. How do you add a spare key If you're not fortunate enough to get a spare key from the dealer when you purchase your Mazda 3 or accidentally break your current key Don't fret, there's an option to make another key. mazda 6 key 'll need a flathead screwdriver and a new CR2025 battery. Once you've got these items you can access the key fob and change the battery. First, locate the button that allows you to release the key. The button is located beneath the metal portion. It's easy to locate. The cover on the back should fall off the moment you press the button. Next, insert the screwdriver's head into the notch or space at the top of the metal part and pry it off. Once the auxiliary key has been removed, insert the new or spare key into the slot. Set the ignition to ON and wait for five seconds before setting it to off. This will register the new information on the key to the system, allowing it to start your car in the future. It is only possible to program three keys in your Mazda 3. The last thing you want is to have more than two working key fobs, and not be in a position to get your vehicle started. This is a safety measure designed to prevent unauthorized users, like valet drivers who are not authorized to use your key and thereby starting your car. How to Reprogram a Spare Key It's a smart idea know how you can reprogram a spare key in the event that your original key gets lost or stolen. This will stop unauthorised people from starting your vehicle or taking it. This should work with any Mazda. You will require two keys that work to begin the reprogramming process. If you don't own two working keys, you'll need to take your vehicle to a dealership to get it done. Begin by stepping into the driver's seat and close all the doors, except the one that is open. Turn the ignition on and then insert the first working key. Wait five seconds before removing the key. Repeat with the second key. After you finish programming your new key you should have three keys that allow you to start your car in the near future. Test each key to ensure sure that they're operating correctly before placing them away. You should think about buying a spare Mazda 3 remote, especially in cases where your car is prone to problems. You can purchase one online or in your local auto store. Be sure to look up reviews before you purchase to ensure you don't buy the wrong key fob that isn't compatible with your vehicle. How do you change the battery on a spare key? It's depressing to find out that the key fob you used to use has gone out and you're in a position to not unlock your vehicle. Luckily, it's easy to replace the battery and save yourself some money at the dealership. Press the auxiliary key button on the back of the keyfob. This will remove the metal key and reveal the slots on both sides of the case. Insert the flathead screwdriver into one of these slots, and gently remove the two parts of the case. When the battery is completely exposed, remove it and place the case in a place where you will not forget it. Be sure to bring a new battery ready before you begin. These batteries can be purchased at any store selling batteries or from a Mazda dealer in Winter Garden. The correct type of battery is essential to ensure that your keyfob works correctly. Replace the cap of the battery and then replace the battery. Be careful not damage the rubber ring that holds the battery. Then, press the two halves of the key fob until you hear the sound of a click. How do I reset the Keyless Entry System The key fob in your Mazda 3 is not only an added convenience, but it's 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 key fob. This is because the key fob has to be reprogrammed at the dealership in order to work again. It can be a stressful and expensive ordeal. Therefore, it's advisable to understand how you can reset the system. Disconnect the battery from the system for 15 minutes. This will clear any residual electric current from the onboard computer. Then, disconnect the LF-ECU connector as well as the demand switch connectors. Verify that the connections are in good order between the terminals. To program the new key or spare, place it in the slot and turn the ignition to ON. Stop the ignition after approximately 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 as many fobs as you would like, but only one should be in use at any specific time. This will stop unauthorized individuals from stealing your key and gaining access to your vehicle. You can purchase a brand new key fob online, however you'll still need to go to a locksmith or dealer in order to get it cut and programmed.