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

It's a good idea always to have an extra key at hand in case you lose the keyfob or it was unable to function. This article will show you how to add, change and re-programme your Mazda 3 keyfobs.

A word of caution Certain keys require programming by a professional locksmith or dealer, while others do not. Use only official Mazda replacements to replace your key fob.

How to add a spare key

You can also add another key in the event that you don't have a spare key or if you accidentally break your current one. You'll need a flathead screwdriver and a CR2025 new battery. Once you've got these tools and are ready to remove the key fob to change the battery. Find the auxiliary key release. It's located under the metal piece and is easy to locate. Once you press the button, the cover should slide off immediately. Next, place the head of the screwdriver into the notch or the space on the top of the metal part and pull it off.

Insert your spare or new key into the slot after removing the secondary key. Set the ignition to ON, and wait for five seconds before setting it to OFF. This will allow the system to recognize the new key and begin your vehicle in the future.

It is important to remember that you can only program up to three keys for your Mazda 3. The most important thing is to have more than two working key fobs, and not be able to get your car started. This is a safety measure to stop unauthorised users from activating your keys and starting your vehicle.

How to Reprogram a Spare Key

It's a good idea to be aware of how to reprogram a spare key in the event that your original key becomes lost or stolen. This will stop unauthorized persons from stealing your car and starting it. This will work with any Mazda. You'll need two keys that are functioning to start the reprogramming process. If you don't own two working keys, you'll need bring your vehicle to the dealership to get it done.

Begin by stepping into the driver's seat, closing all the doors except the one that is open. Turn the ignition on and insert the initial working key. Then wait five seconds before taking out the key. Repeat the process with the second key.

After you finish programming your new key, you'll have three keys that will be able to start your vehicle in the future. Before you store each key, make sure that it's working correctly.

You should think about buying an extra Mazda 3 remote, especially if your car is prone to problems. You can purchase one online or at a local automotive store. Make sure you review the reviews before buying to ensure that you don't purchase the wrong key fob that isn't compatible with your car.

How do you change the battery on a spare key?


It's very frustrating to discover that the key fob you used to use has gone out, and you are not able to unlock your vehicle. Fortunately, it's easy to replace the battery and save some cash at the dealership.

The first step is to press the auxiliary key button on the back of the key fob. This will take out the metal key and reveal two slots on the opposite side of the case. Insert the flathead screwdriver into one of these slots. Then, gently break the two parts of the case. When the battery is completely exposed, take it out and place the case somewhere safe from being lost.

Before you start, make sure you have a new replacement battery. They are available at any store that sells batteries or at a Mazda dealer near Winter Garden. The right kind of battery is vital to make sure that your keyfob functions correctly.

Replace the cap of the battery and then install the new battery. Be careful not to scratch the small rubber ring the battery rests on. Press the two halves together until you can hear the click.

How to reset a Keyless Entry System

The Mazda 3 key fob is not just a piece of equipment for convenience. It's also an element of security. The car won't start if your key is lost or stolen, even if you've got a spare key fob. The key fob should be reset by the dealer to allow it to work again. It's a difficult and costly process. Therefore, mazda key G28CarKeys to learn how to reset the system.

Disconnect the battery from the system for 15 minutes. This will erase any residual electricity from the onboard computer. Next, disconnect both the LF-ECU connector and the demand switch connectors. Check continuity between the following terminals.

To program an entirely new key or spare, insert it into the slot and set the ignition to ON. Keep the key in place for about five seconds, then turn it off. The key's details will be transferred to your vehicle's computer and the new fob will be able start your vehicle in the future. You can program up to three fobs, but you should only use one at each time. This will keep unauthorised individuals from stealing your key and gaining access to your car. You can purchase a replacement keyfob on the internet, but it must be cut and programmed by a dealer.