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How to Add, Change, and Reprogram a Mazda 3 Spare Key

It's a good idea always to keep a spare key on hand regardless of whether you lost your keyfob, or it was unable to function. This article will show you how to add, alter, and reprogramme your Mazda 3 keyfobs.

A word of caution: some keys require programming by a locksmith professional or dealer, while other keys do not. Make sure you only use genuine Mazda replacements for your key fob.

How to add a spare key

If you're not lucky enough to get a spare key from the dealer when you purchase your Mazda 3 or accidentally break your current key but don't worry, there's an option to make another key. You'll need the flathead screwdriver, as well as a new CR2025 battery. Once you've got these items, it is time to open the key fob. First, locate the key release button for the auxiliary key. 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 head into the notch on top or in the space, and pull the metal piece off.

After the auxiliary keys are removed, insert the new or spare key into the slot. Set the ignition to ON, and wait about five seconds before turning it to OFF. This will register the new information on the key to the system and allow it to start your car in the future.

You can only program three keys on your Mazda 3. You don't want to use more than two key fobs to start your car. This is a precautionary measure to prevent unauthorized users from activating your key fobs and starting your car.

How to Reprogram a spare key

It's a good idea to know how you can reprogram a spare key in the event that your original key gets lost or stolen. This will keep unauthorised persons from starting your car or stealing it. This procedure should work with any Mazda however, you'll require two working keys to start the process of reprogramming. If you don't have the two working keys, you'll need take your vehicle to the dealership to have it done.

Begin by stepping into the driver's position, and close all the doors, except the one that is open. Set the ignition to ON and insert the initial working key. After mazda keys replacement , remove the key. Repeat with the second key.

Once you've completed programming your new key, you'll have 3 keys that will work to start your vehicle in the future. Before you store each key, make sure it's functioning correctly.

You should think about purchasing an extra Mazda 3 remote, especially in the event that your vehicle is prone to problems. You can purchase one on the internet or at a local automotive store. Make sure you review the reviews before buying so that you don't get an item that isn't compatible with your vehicle.

How to change the Battery on a spare key

There's nothing more frustrating than discovering that the battery in your key fob has been damaged and you're unable to unlock your car. It's easy to replace the battery yourself and save money at the dealership.

Press the auxiliary key button at the back of the keyfob. This will take out the key made of metal and reveal a slot on each side of the case. Press the flathead into one of these slots and then gently pull the two halves apart. When the battery is completely exposed, remove it and put it away in a place where you will not forget it.

Before you begin, make sure that you have a brand new replacement battery. You can find these in any store that sells batteries or at an Mazda dealer close to Winter Garden. Choosing the correct battery will ensure that your key fob is working correctly.

Replace the cap of the battery and then install the new battery. Be careful not to scratch the small rubber ring the battery sits on. The two halves should be pressed together until you hear a click.

How do I reset the Keyless Entry System


The Mazda 3 key fob is not just a piece of equipment for convenience. It also serves as an important security feature. If you lose your key, or have it stolen the car won't start even if you've got the spare fob. This is because the key fob has to be reset at the dealership to work properly. It can be a frustrating and costly experience. Therefore, 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 residual power from the on-board computer. Next, disconnect both the LF-ECU and demand switch connectors. Check continuity between the following terminals.

Insert the key into the slot, and switch on the ignition. The key should remain in the ignition for about five seconds, then switch it off. The key's information is added to the computer in your car and the new fob can start your car. You can program up to three fobs however, you must only use one at one time. This will prevent unauthorized people from stealing your key and gaining access to your car. You can buy a new keyfob online, but it must be programmed and cut by a dealer.