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How to Add, Change, and Reprogram a Mazda 3 Spare KeyIt's a good idea to have an extra key in your pocket, whether you dropped your keyfob or it has stopped working. This article will tell you how to add, modify or reprogramme your Mazda 3 keyfobs.Certain keys require programming from professional locksmiths, while others do not. Make sure you only make use of official Mazda replacements for your key fob.How to add a spare keyYou can also add an additional key if you don't have a spare key available or if you accidentally break your current one. To accomplish this, you'll need a small screwdriver with a flat head and an updated CR2025 battery. Once you've got these tools you can open the key fob and swap the battery. Find the auxiliary key release. It's located underneath the metal part and is easy to find. The cover that covers the back should come off the moment you press the button. Then, insert the screwdriver's head into the notch or the space on the top of the metal component and pry it off.Insert your spare key or a new one into the slot after removing the secondary key. Turn on the ignition and wait for five seconds, and then turn it to off. This will add the new key's information into the system which will allow it to start your car in the future.It is only possible to program three keys in your Mazda 3. You don't want to use more than two key fobs to start your car. This is a safety measure to stop anyone who is not authorized from activating your key fobs and starting your vehicle.How to reprogram a spare key?It's smart to be aware of how to reprogram a spare key in the event that your original key becomes lost or stolen. This will prevent unauthorised persons from stealing your car and starting it. This method should work on any Mazda however you'll need two keys working to begin the process of reprogramming. If you don't own two keys that work, it's best to take your Mazda to the dealer to get this done.Start by stepping into driver's position and close all the doors, except the one that is open. Turn the ignition on and insert the first functioning key. For five seconds, remove the key and repeat the process with the second working key.After programming your new key you should have 3 keys that will start your vehicle in the future. Check mazda 3 spare key G28CarKeys to make sure that they're operating correctly before throwing them away.You should consider buying a spare Mazda 3 remote, especially when your car is susceptible to problems. You can buy one online or at a local automotive store, but be sure to read the reviews before purchasing so that you can avoid getting one that's not compatible with your vehicle.How do I change the battery on a spare keyIt's very frustrating to discover that your key fob has failed, and you are not able to unlock your vehicle. Fortunately, it's easy 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 made of metal and reveal an opening on each side of the case. Put the flathead screwdriver in one of these slots and gently remove the two halves of the case. Once the battery is fully exposed, take it out and set aside the case somewhere safe from being lost.Before you begin, make sure that you have a brand new replacement battery. They can be found at any retailer that sells batteries or at a Mazda dealer close to Winter Garden. Using the correct type of battery will ensure that your key fob is working perfectly.Then, put the new battery in its place and then replace the cap on the battery. Be careful not to scratch the small rubber ring that the battery rests on. The two halves should be pressed together until you can hear the click.How to reset the system's Keyless Entry SystemThe 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 won't start even if you have the spare key fob. This is because the fob that you have to be reset at the dealership in order to function properly. This can be a costly and frustrating ordeal therefore it's a great idea to know how to reset the system yourself.Disconnect the battery from the system for 15 minutes. This will remove any residual electrical current from the computer on board. Then, disconnect the LF ECU and demand switch connectors. Verify the continuity between the next terminals.Put the key in the slot and switch on the ignition. The key should remain in the ignition for about five seconds, then turn it off. The information from the key will be added to your vehicle's computer, and the new fob will be able to start your vehicle in the future. You can program up to three fobs, however, you should only use one at each time. This will prevent unauthorized persons from copying the key and gaining access to your car. You can purchase a brand new key fob online, however you'll still need to go to a locksmith or dealer in order to have it cut and programmed.