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

If you've dropped your key fob on the floor or it has stopped working, it's always best to have an extra key available. This article will explain everything you need to be aware of changing, adding, and changing your Mazda 3 key fobs.

Note: Some keys require programming by professional locksmiths, while others do not. Use only official Mazda replacements to replace your key fob.

How to add a spare key

If you're unable to receive a spare keys from the dealer when you purchase your Mazda 3 or accidentally break your current one, don't worry -- there's an option to make another key. You'll need to use the flathead screwdriver, as well as a new CR2025 battery. Once you've got these items, it is time to open the key fob. First find the auxiliary key release button. It's located on the underside the metal portion. It's easy to locate. Once you hit the button, the cover should fall off right away. Next, place the head of the screwdriver into the notch, or the spacing at the top of the metal component and pull it off.

Once the auxiliary key has been removed, insert the new or spare key into the slot. Set the ignition ON and wait for five seconds, then set it to OFF. This will add 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 in your Mazda 3. The one thing you don't want is to have more than two working key fobs and not be in a position to get your vehicle started. This is a security precaution that is designed to block unauthorized users, such as valet drivers from activating your key and thereby launching your vehicle.

How to reprogram an unrepaired key

It's smart to know how you can reprogram an extra key in the event that your original key is lost mazda 3 key fob or stolen. This will stop unauthorised people from starting your car, or taking it. This should work with any Mazda. You will need two keys that are working to begin the reprogramming. If you don't own two keys that work then it's best to bring your car to a dealer to get this done.

Begin by putting yourself in the driver's seat, and shutting the door, excluding for the one that's opened. Set the ignition to ON and insert the first functioning key. Take five seconds before removing the key. Repeat the process with the second key.

Once you've finished programming your new key, you should have three keys that you can use to start your vehicle in the future. Before saving each key, be sure that it's functioning properly.

It's a good idea to purchase an extra Mazda 3 key fob, particularly if you're a driver who often loses your key or has other issues with it. It's possible to find one on the internet or at your local auto store, but be sure to read reviews prior to purchasing so you can avoid getting one that's not compatible with your car.

How do you change the battery using a spare key

There's nothing worse than finding that the battery on your key fob 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 located at the back of the keyfob. This will remove the metal auxiliary key and expose two slots on the sides of the case. Insert the flathead screwdriver into one of these slots and then gently take apart the two halves of the case. Once the battery is fully exposed, take it out and set aside the case somewhere you won't forget it.

Be sure to have an extra battery in place before you start. You can purchase them in any store that sells batteries or at a Mazda dealer close to Winter Garden. The right kind of battery is essential to ensure that your keyfob is working correctly.

Replace the cap on the battery, and then install the new battery. Be careful not to scratch the rubber ring that holds the battery. The two halves should be pressed together until you hear a click.

How do I reset the Keyless Entry System

The Mazda 3 key fob is not just a convenient feature. It also serves as a security measure. If you lose your key or have it stolen the car won't start even if you've got the spare fob. The key fob has to be reset by the dealer to make it work again. This can be a painful and costly ordeal. Therefore, it's recommended to learn how to reset the system.

To reset the system, disconnect the battery for 15 minutes. This will clear any residual electricity from the on-board computer. Then, disconnect the LF ECU and demand switch connectors. After that, test for continuity between the following terminals:

Put the key in the slot, then turn the ignition ON. Switch off the ignition after approximately five seconds. The key's details are now added to the vehicle's computer and the new fob can start your vehicle. You can program up to three fobs, however, you should only use one at a time. This stops unauthorized individuals from copying the key and getting ahold of your vehicle. You can purchase a new key fob online, but you'll still have to visit an expert locksmith or dealer to have it cut and programmed.