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How to Add, Change, and Reprogram a Mazda 3 Spare KeyIf you've dropped your key fob on the floor or it simply stopped working, it's an excellent idea to keep a spare key on hand. This article will cover everything you must learn about changing, adding, and reprogramming your Mazda 3 key fobs.Note: Some keys require programming from an expert locksmith, while others don't. Make sure you only make use of official Mazda replacements for your key fob.How to add a spare keyYou can add an additional key if you don't have a spare key, or in the event that you break your current one. To do this, you'll need an incredibly small screwdriver, a flathead screwdriver, and the new CR2025 batteries. Once you've got these items, it's time to open up the key fob and replace the battery. Find the auxiliary key release. new mazda key fob G28 Car Keys is on the underside the metal portion. It's easy to locate. Once you hit the button, the back cover should slide off immediately. Then, insert the screwdriver's tip into the notch at the top or the space, and pry the metal part off.After the auxiliary keys are removed, insert your new or spare key into the slot. Set the ignition to ON and wait for about five seconds before setting it to OFF. This will add the new key's information into the system that will allow it to start your car in the future.You can only program three keys in your Mazda 3. The one thing you don't want is to have more than two working key fobs but not be able to get your car started. This is a safety measure designed to stop unauthorized users, like valet drivers, from activating your key and starting your car.How do I reprogram a spare keyIf you have a spare key, it's best to be aware of how to reprogram it in case your original key gets lost or stolen. This will stop unauthorised people from starting your car or stealing it. This will work with any Mazda. You'll require two keys that are functioning for the reprogramming to begin. If you don't have two functioning keys, you'll have to bring your vehicle to the dealership to have it done.Start by stepping into driver's position and close all the doors with the exception of the one that is open. Place the working key in the slot, then set the ignition to the ON position. Wait five seconds before removing the key. Repeat with the second key.After programming your new key, you should have three keys that start your vehicle in the future. Before storing each key, make sure it's working properly.It's a good idea buy a spare Mazda 3 key fob, especially if your car is one who has a tendency to lose their keys or has other issues with it. You can purchase one online or at your local auto store. Be sure to go through reviews prior to purchasing to ensure you don't buy the wrong key fob that isn't compatible with your car.How do I change the battery on a Spare KeyIt's a nightmare to discover that your key fob has died, and you are not able to unlock your car. It's easy to replace the battery yourself and save money at the dealer.The first step is to press the auxiliary key button located on the back of the key fob. This will remove the key that is used as an auxiliary key, and expose an opening on both sides of the case. Insert the flathead screwdriver into one of these slots, and gently break the two halves of the case. Once the battery is fully exposed, remove it and place the case somewhere that you won't forget about it.Before you begin, be sure you have a new replacement battery. They are available at any store that sells batteries or at a Mazda dealer close to Winter Garden. The right type of battery is essential to ensure that your keyfob is working correctly.Replace the cap on the battery, and then replace the battery. Be careful not to damage the rubber ring on which the battery rests. The two halves should be pressed together until you hear a click.How do I reset the system's Keyless Entry SystemThe key fob on your Mazda 3 is not only a convenience, 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 key fob needs to be reset at the dealership to work once more. It can be a frustrating and costly ordeal. Therefore, it's advisable to know how to reset the system.Disconnect the battery from the system for 15 minutes. This will remove any remaining electrical current from the computer on board. The next step is to disconnect the LF-ECU and demand switch connectors. Check for continuity between the terminals.Place the key into the slot, then switch on the ignition. Stop the ignition after approximately five minutes. The key's details will be added to the vehicle's computer and the new fob will be able to start your car in the future. You can program any number of fobs you would like, but only one should be used at a particular time. This stops unauthorized individuals from copying your key and getting ahold of your vehicle. You can purchase a brand new key fob on the internet, but you'll need to visit an expert locksmith or dealer to have it cut and programmed.