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

Whether you dropped your key fob on the floor or it stopped working, it's always an excellent idea to keep an extra key available. This article will provide everything you must learn about the process of adding, changing, and changing the programming of your Mazda 3 key fobs.

Note: Some keys require programming by a professional locksmith, while others don't. Make sure you only use genuine Mazda replacements for your key fob.

How do I add a spare key?

If you're not fortunate enough to receive a spare keys from the dealer when you buy your Mazda 3 or accidentally break your current one Don't fret, there's still an option to get another key. To do this, you'll need a small screwdriver with a flat head and an CR2025 battery that's new. Once you've got the tools you can access the key fob and change the battery. First find the button that allows you to release the key. It's located under the metal piece and is easy to find. Once you hit the button, the back cover will fall off instantly. Then, you can insert the screwdriver's head into the notch or the space on the top of the metal part and then pull it off.

Insert your spare or new key into the slot after removing the secondary key. Turn on the ignition and wait for about five seconds, then set it to off. This will register the new information on the key to the system that will allow it to start your vehicle in the future.


You can only program three keys into your Mazda 3. The last thing you want is to have more than two functioning key fobs, and not be in a position to get your car started. This is a security measure designed to prevent unauthorized users, like valet drivers who are not authorized to use your key and thereby launching your vehicle.

How to Reprogram a Spare Key

If you have a spare key, it's important to be aware of how to program it in the event the original key you had is lost or stolen. This will keep unauthorised persons from opening your car or stealing it. This method should work on any Mazda however, you'll require two keys working to begin the process of reprogramming. If you don't have two keys that work, it's best to take your Mazda to a dealer to get this done.

Start by stepping into driver's position, and close all the doors, except the one that is open. Set the ignition to ON and insert the first functioning key. After five seconds, remove the key and repeat the procedure with the second key.

Once you've completed programming your new key, you'll have 3 keys that allow you to start your car in the future. Test each key to be sure they're working correctly before putting them away.

It's a good idea to purchase a spare Mazda 3 key fob, especially if you're a driver who often loses your key or has other issues with it. You can find one online or at a local automotive retailer, but make sure to read reviews before purchasing so that you can avoid getting the wrong key fob compatible with your vehicle.

How do mazda replacement key fob change the battery with a spare key?

It's depressing to find out that your key fob is dead and you're unable to unlock your car. It's a good thing that it's simple to replace the battery and save yourself some cash at the dealership.

Press the auxiliary key button on the back of the keyfob. This will take out the key's metal cover and reveal two slots on the opposite side of the case. Press the flathead into one of these slots, and then gently pry the two halves apart. After the battery is fully exposed, remove the case and put it in a spot where you'll never forget about it.

Be sure to have a new battery ready prior to starting. They can be bought from any store that sells batteries or from a Mazda dealer in Winter Garden. Choosing the correct battery will ensure that your key fob is working perfectly.

Replace the cap on the battery, and then insert the new battery. Be careful not to damage the small rubber ring that the battery sits on. Press the two halves together until you can hear the click.

How to Reset a Keyless Entry System

The key fob that you have in your Mazda 3 is not only a convenience, it's also an important security feature. If you lost your key or had it stolen the car will not start even if you have the spare fob. This is because the key fob has to be reset at the dealership to work properly. It's a difficult and costly experience. So, it's best to learn how to reset the system.

Remove the battery from the system for 15 minutes. This will erase any residual electrical power in the on-board computer. Then, disconnect the LF -ECU and demand switch connectors. Check for continuity between the following terminals:

Insert the key into the slot, then turn the ignition ON. Switch off the ignition after approximately five seconds. The key's information has been added to the vehicle's computer and the new fob can start your car. You can program up to three fobs however, you must only use one at each time. This prevents unauthorized people from copying your key and gaining access to your car. You can purchase a brand new keyfob online, but it must be cut and programmed by an authorized dealer.

Website: https://www.autokeys-r-us.co.uk/mazda/