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

It's a good idea to have an extra key at hand in case you lose your keyfob or it stopped working. mazda key fob replacement G28CarKeys will go over everything you should be aware of adding, changing, and changing your Mazda 3 key fobs.

Be aware that some keys require programming by professional locksmiths, while others do not. Make sure you use only authentic Mazda replacements to replace your key fob.

How to add an additional key

If you're not lucky enough to get a spare key from the dealer when you buy your Mazda 3 or accidentally break your current key, don't worry -- there's still the option of adding another key. You'll need an flat-head screwdriver and an CR2025 battery. Once you have these items you can open up the key fob to change the battery. Find the auxiliary key release. It's located on the underside of the metal part and is easy to find. The cover that covers the back should come off when you press the button. Then, you can insert the head of the screwdriver into the notch or spacing at the top of the metal piece and pull it off.

Insert your spare or new key into the slot after you have removed the additional key. Set the ignition to ON and wait for around five seconds before turning it to off. This will add the new key's information into the system which will allow it to start your vehicle in the future.

It is important to remember that you can only program up to three keys on your Mazda 3. You don't want to have to utilize more than two key fobs in order to start your vehicle. This is a security precaution designed to prevent unauthorised users, such as valet drivers from activating your key and thereby launching your vehicle.

How to reprogram an unrepaired key

If you have a spare key, it's a good idea know how to reprogram it in case your original key gets lost or stolen. This will keep unauthorised persons from starting your vehicle or stealing it. This procedure should work with any Mazda but you'll need two keys working to begin the reprogramming. If you don't have two keys that work then it's best to bring your Mazda to the dealer to get this done.

Start by stepping into the driver's seat, close all the doors with the exception of the one that is open. Set the ignition to ON and insert the first working key. Wait five seconds, then take the key out and repeat the process with a second key.

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

You should think about purchasing a spare Mazda 3 remote, especially if your car is prone to issues. You can buy one online or at your local auto store, but be sure to read reviews before buying so you aren't buying the wrong key fob compatible with your car.

How do I change the battery on a spare key

It's awful to discover that your key fob has died, and you are unable to unlock your vehicle. It's not a problem 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 remove the key made of metal and reveal two slots on the opposite side of the case. Put the flathead screwdriver in one of these slots, and gently break the two parts of the case. Once the battery has been fully exposed, remove the case and place it somewhere that you will not forget it.

Before you start, make sure that you have a brand new replacement battery. They can be bought at any store selling batteries or from a Mazda dealer in Winter Garden. Using the correct type of battery will ensure that your key fob operates properly.

Replace the cap of the battery and then replace the battery. Be careful not damage the rubber ring that holds the battery. Press the two halves together until you hear the click.

How do I reset the system's 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. The car won't start if your key is stolen or lost, even if you've got a spare key fob. The key fob needs to be reprogrammed by a dealer to allow it to work again. It can be a stressful and expensive ordeal. Therefore, it's best to understand how you can reset the system.

To reset the system, unplug the battery for 15 minutes. This will remove any residual electricity from the onboard computer. Then, disconnect the LF ECU and demand switch connectors. Check for continuity between the following terminals:

To program a new key, or a spare, insert it into the slot and set the ignition to ON. Put the key in for about five seconds and then switch it off. The key's details are now transferred to the computer of your vehicle and the new fob will start your car. You can program up to three fobs, however, you must only use one at a time. This stops unauthorized individuals from copying your key and gaining access to your car. You can purchase a replacement keyfob online, but it must be cut and programmed by an authorized dealer.