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How to Add, Change, and Reprogram a Mazda 3 Spare Key If you've dropped your key fob on the ground or it has stopped working, it's a good idea to have an extra key available. This article will explain everything you need to be aware of when changing, adding, and changing your Mazda 3 key fobs. Certain keys require programming by professional locksmiths, while others do not. Be sure to only use official Mazda replacements for your key fob. How to add a spare key You can add another key in the event that you don't have a spare key, or in the event that you break the one you have. To accomplish this, you'll need a small screwdriver with a flat head and a new CR2025 battery. Once you've got these items you can access the key fob and change the battery. Locate the key release auxiliary. The button is located on the underside the metal portion. It's easy to find. Once you hit the button, the back cover should slide off immediately. Then, you can insert the screwdriver's tip into the notch at the top or into the space and pry the metal part off. Once the auxiliary key has been removed, insert the new or spare key into the slot. Set 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 start your vehicle in the future. It is only possible to program three keys into your Mazda 3. The most important thing is to have more than two working key fobs, and not be capable of getting 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 launching your vehicle. How to Reprogram a spare key If you have a spare key it's best to know how to program it in the event your original key is stolen or lost. This will stop unauthorized persons from taking your car and then starting it. This process is compatible with any Mazda, though you'll need two keys that work to begin the reprogramming. If you don't have the two working keys, you'll need to take your vehicle to the dealership to complete the process. Begin by stepping into your driver's seat, and close the door, with the exception for the one that's open. Put the first working key in the slot, and then turn the ignition to ON. After five seconds, take the key out and repeat the process with the second key. After you finish programming your new key you should have three keys that will allow you to start your vehicle in the future. Before saving each key, be sure that it's functioning properly. It's a good idea to purchase a spare Mazda 3 key fob, especially if you're a driver who frequently loses their key or has other issues with it. You can purchase one online or at a local automotive store. Be sure to go through reviews prior to purchasing to ensure that you don't purchase the wrong key fob that isn't 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 died, and you are locked out of your vehicle. Luckily, it's easy to replace the battery and save yourself some 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 key's metal cover and reveal two slots on the opposite side of the case. Insert the flathead screwdriver into one of these slots and then gently pry apart the two sides of the case. Once the battery has been fully exposed, remove the case and place it somewhere you will not forget it. Before you begin, make sure you have a new replacement battery. They can be bought from any store that sells batteries or from a Mazda dealer in Winter Garden. Using the right type of battery will ensure that your key fob is working properly. Next, put mazda 2 key 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. Press the two halves together until you hear a click. How to Reset the system's Keyless Entry System The Mazda 3 key fob is not just a practical feature. It's also an element of security. The car will not start if your key is stolen or lost, even if you've got a spare fob. The key fob has to be reprogrammed by a dealer to allow it to work again. It can be a frustrating and costly ordeal. So, it's best to learn how to reset the system. To reset the system, unplug the battery for about 15 minutes. This will eliminate any remaining electricity from the onboard computer. Then, disconnect the connectors for the LF-ECU and the demand switch connectors. Check for continuity between the terminals. Place the key in the slot, then turn the ignition ON. The key should remain in the ignition for about five seconds and then switch off. The key's details are now added to the vehicle's computer and the new fob is able to start your car. You can program as many fobs as you would like but only one can be used at a given time. This will stop unauthorised people from copying the key and getting ahold of your vehicle. You can buy a new key fob on the internet, but you'll need to visit a dealer or locksmith to cut it and get it programmed.