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Author : Meyer Soelberg | Published On : 27 May 2024

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

It's a good idea to keep an extra key on hand regardless of whether you lost the keyfob or it was unable to function. This article will explain how to add, alter and re-programme your Mazda 3 keyfobs.

A word of caution Certain keys require programming by a locksmith professional or dealer, whereas other keys do not. Be mazda key fobs g28carkeys.co.uk to only make use of official Mazda replacements for your key fob.

How to add an additional key

You can add an additional key in case you don't have a spare key, or if you accidentally break your current one. You'll need to use the flathead screwdriver, as well as a CR2025 new battery. Once you've got the tools you can remove the key fob and swap the battery. First look for the key release button for the auxiliary key. It's located under the metal piece and is easy to locate. The cover on the back should fall off as soon as you press the button. Then, you can insert the screwdriver's head in the notch on top or in the space, and pry the metal part off.

Insert your spare key or a new one into the slot after taking out the additional key. Set the ignition to ON and wait about five seconds before setting it to off. This will register the new key's information into the system and allow it to start your car in the future.

It is only possible to program three keys into your Mazda 3. You don't want to have to utilize more than two keys to start your vehicle. This is a safety measure designed to stop unauthorized users, like valet drivers who are not authorized to use your key and thereby launching your vehicle.

How to Reprogram a Spare Key

It's smart to learn how you can reprogram an extra key in the event that your original key becomes lost or stolen. This will prevent unauthorised persons from taking your car and then starting it. This should work with any Mazda. You'll need two keys that work to begin the reprogramming. If you don't own two working keys, you'll need to bring your vehicle to the dealer to get it done.

Start by stepping into the driver's position, and close all the doors, except the one that is open. Insert the first working key in the slot, and then set the ignition to ON. Then wait five seconds before taking out the key. Repeat with the second key.

After programming your new key you should have three keys that be able to start your car in the near future. Before you store each key, make sure it's working properly.


You should think about purchasing a spare Mazda 3 remote, especially in cases where your car is prone to issues. You can find one online or at your local auto store, but be sure to read the reviews before buying so that you aren't purchasing an item that isn't compatible with your car.

How do I change the battery on a spare key?

There's nothing more frustrating than discovering that your key fob battery has been damaged and you're unable to unlock your vehicle. It's a good thing that it's simple to replace the battery and save yourself some money at the dealership.

The first step is to press the auxiliary key button located on the back of the key fob. This will take out the key made of metal and reveal two slots on the opposite side of the case. Put the flathead into one of these slots and gently pry the two halves of the case apart. Once the battery has been fully exposed, take it out of the case and place it somewhere you will not forget it.

Be sure to have a replacement battery before you begin. These batteries can be purchased from any store that sells batteries or from a Mazda dealer in Winter Garden. The correct type of battery is essential to ensure that your key fob functions properly.

Then, place the new battery in the correct place and replace the cap on the battery. Be careful not to scratch the rubber ring that holds the battery. The two halves should be pressed together until you can hear the click.

How to reset a Keyless Entry System

The Mazda 3 key fob is not just a practical feature. It also serves as an important security feature. If you lose your key or have it stolen the car will not start even if you've got the spare fob. This is because the key fob needs to be reset at the dealership in order to work again. It can be a costly and time-consuming process, so it's a good idea to learn how to reset the system yourself.

Remove the battery from the system for 15 minutes. This will clear any residual electrical current from the computer on board. The next step is to disconnect the LF-ECU and demand switch connectors. Check continuity between the following terminals.

Insert the key into the slot, then turn on the ignition. Put the key in for about five seconds, then turn off. The key's information is transferred to the computer of your vehicle and the new fob will start your vehicle. You can program up to three fobs however, you should only use one at each time. This will prevent unauthorized people from stealing your keys and gaining access to your vehicle. You can buy a new keyfob on the internet, but it'll still need to be programmed and cut by a dealer.