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

Whether you dropped your key fob on the ground or it just stopped working, it's recommended to keep a spare key handy. This article will show you how to add, alter or reprogramme your Mazda 3 keyfobs.

Warning: Some keys require programming by an expert locksmith, while others don't. Make sure to make use of official Mazda replacements for your key fob.

How to add an additional key

You can add an additional key if you don't have a spare key available or in the event that you break the one you have. To accomplish this, you'll require a small flathead screwdriver and the new CR2025 batteries. Once you've got these items you need, it's time to open the key fob. First find the button that allows you to release the key. It's on the underside of the metal piece and is easy to find. Once you hit the button, the cover should fall off right away. Next, insert the screwdriver's head into the notch or spacing at the top of the metal part and then pull it off.

Once the auxiliary key has been removed, insert the 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 allow the system to recognize the new key and begin your vehicle in the future.

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

How to Reprogram a Spare Key

It's a good idea to learn how you can reprogram an extra key in the event that your original key is lost or stolen. This will prevent unauthorized people from starting your vehicle or stealing it. This procedure should work with any Mazda, though you'll need two keys working to begin the process of reprogramming. If you don't have the two working keys, you'll need bring your vehicle to the dealer to get it done.

Start by stepping into replacement mazda 3 key , close all the doors with the exception of the one that is open. Put the first working key into the slot, and then set the ignition to ON. Take five seconds before removing the key. Repeat with the second key.

After you've completed programming your new key, you should have three working keys that you can use to start your car in the future. Before you store each key, make sure that it's functioning properly.

It's a good idea to buy 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 on the internet or at your local auto store. Make sure you review the reviews before buying to ensure that you don't get a key fob which isn't compatible with your vehicle.

How to change the Battery on a Spare Key

It's very frustrating to discover that your key fob has failed, and you are unable to unlock your car. It's easy to change the battery yourself and save money at the dealership.

Press the auxiliary key button on the back of the keyfob. This will remove the key from the metal and reveal a slot on each side of the case. Use the screwdriver's flathead to push it into one of these slots and then gently take apart the two sides of the case. Once the battery is fully exposed, take it out and place it in a safe place in a place where you will not forget it.

Before you start, make sure you have a new replacement battery. These batteries can be purchased at any store selling batteries or from a Mazda dealer in Winter Garden. Choosing the right battery will ensure that your key fob functions correctly.

Replace the battery cap and then install the new battery. Be careful not damage the rubber ring on which the battery rests. 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 convenience. It also serves as an important security feature. The car will not start if the key is lost or stolen even if you have an extra key fob. This is because the key fob needs to be reset at the dealership to work again. This could be a costly and time-consuming process It's a good idea to know how to reset the system yourself.

To reset the system, disconnect the battery for around 15 minutes. This will remove any remaining electric current from the onboard computer. Next, disconnect the LF-ECU and demand switch connectors. Then, check continuity between the following terminals:


Insert the key into the slot and switch the ignition on. Keep the key in place for about five seconds, then turn off. The information from the key will be transferred to your vehicle's computer and the new fob will be able start your car in the future. You can program as many fobs you want however only one should be used at any specific time. This will stop unauthorized individuals from stealing your key and getting access to your vehicle. You can buy a new key fob online, however you'll still have to visit an expert locksmith or dealer to cut it and get it programmed.