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How to Add, Change, and Reprogram a Mazda 3 Spare KeyWhether you dropped your key fob on the floor or it simply stopped working, it’s always an excellent idea to keep an extra key available. This article will teach you how to add, alter or reprogramme the Mazda 3 keyfobs.Note: Some keys require programming by an expert locksmith, while others do not. Make sure to make use of official Mazda replacements for your key fob.How do I add an additional keyIf you’re not lucky enough to find a spare key from the dealership when you buy your Mazda 3 or accidentally break your current key, don’t worry — there’s still an option to make another key. You’ll need to use the flathead screwdriver, as well as the CR2025 replacement battery. Once you’ve got these items and are ready to access the key fob and swap the battery. Find the auxiliary key release. It’s located on the underside of the metal portion and is easy to find. The cover on the back should fall off as soon as you press the button. Then, place the screwdriver’s head into the notch on top or the space and take the metal part away.Once the auxiliary key is removed, insert your new or spare key into the slot. Set the ignition ON and wait for approximately five seconds, then set it to OFF. This will allow the system to recognize the new key and start your vehicle in the future.You can only program three keys to your Mazda 3. mazda spare key want is to have more than two functioning key fobs and not be capable of getting your vehicle started. This is a safety measure to stop anyone who is not authorized from activating your key fobs and starting your car.How to Reprogram a spare keyIt’s a smart idea learn how you can reprogram an extra key in the event that the original key is lost or stolen. This will stop unauthorized persons from stealing your car and starting it. This will work with any Mazda. You will require two keys that are functioning to begin the reprogramming. If you don’t own two keys that function, it’s best to take your vehicle to a dealer to get this completed.Begin by stepping into the driver’s seat and shutting all doors, with the exception of the one that is open. Turn the ignition on and insert the first functioning key. Then wait five seconds before taking out the key. Repeat with the second key.After programming your new key, you should have 3 keys that allow you to start your car in the near future. Test each key to be sure that they’re operating correctly before taking them off.You should consider buying a spare Mazda 3 remote, especially in the event that your vehicle is prone to issues. You can purchase one on the internet or at your local auto store. Make sure to read reviews before purchasing so that you don’t get an item that isn’t compatible with your car.How do I change the battery on a spare keyIt’s awful to discover that the key fob you used to use has gone out and you’re not able to unlock your vehicle. It’s a good thing that it’s simple to replace the battery and save some money at the dealer.The first step is to press the auxiliary key button on the back of the key fob. This will take out the key from the metal and reveal the slots on both sides of the case. Put the flathead into one of these slots, and then gently pry the two halves apart. After the battery is fully exposed, take it out of the case and place it somewhere you will not forget about it.Be sure to bring a new battery ready before you start. They can be bought from any store that sells batteries or from a Mazda dealer in Winter Garden. The correct battery is crucial to make sure that your keyfob functions properly.Replace the battery cap and then insert the new battery. Be careful not to scratch the small rubber ring that the battery is placed on. The two halves should be pressed together until you can hear the click.How can I reset the Keyless Entry SystemThe key fob on your Mazda 3 is not only an option for convenience, it’s an important security feature. The car will not start if the key is stolen or lost even if you have a spare key fob. The key fob needs to be reset by the dealer to make it work again. It’s a difficult and costly ordeal. Therefore, it’s recommended to learn how to reset the system.Disconnect the battery from the system for 15 minutes. This will erase any residual electrical current from the computer on board. The next step is to disconnect the LF-ECU and demand switch connectors. Check continuity between the following terminals.To program a new key or a spare, insert it into the slot and turn the ignition to ON. Turn off the ignition after about five seconds. The key’s details are now transferred to the computer of your vehicle and the new fob will start your car. You can program any number of fobs you would like however only one must be used at a certain time. This will prevent unauthorized people from stealing your keys and gaining access to your car. You can purchase a replacement key fob on the internet, but you’ll need to visit a dealer or locksmith to cut it and get it programmed.