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

If you've dropped your key fob on the ground or it simply stopped working, it's always best to have a spare key handy. This article will provide everything you must know about adding, changing, and reprogramming your Mazda 3 key fobs.

Note: Some keys require programming by an expert locksmith, while others don't. Be sure to only use official Mazda replacements for your key fob.

How do I add a spare key?

If you're not lucky enough to receive a spare keys from the dealership when you buy your Mazda 3 or accidentally break your current key, don't worry -- there's a way to add another key. To accomplish this, you'll require a small flathead screwdriver and a new CR2025 battery. Once you've got these items and are ready to open up the key fob and swap the battery. First find the auxiliary key release button. It's located beneath the metal part. It's easy to find. The back cover should come off the moment you press the button. Then, insert the screwdriver's head into the notch, or the spacing on the top of the metal piece and then pull it off.

Once the auxiliary key has been removed, insert the new or spare key into the slot. 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's important to note that you can only program up to three keys for your mazda replacement key 3. You don't want to use more than two keys to start your car. This is a safety precaution that is designed to block unauthorized users, such as valet drivers who are not authorized to use your key and thereby starting your car.

How to reprogram an unrepaired key?

It's a smart idea know how you can reprogram a spare key in the event that the original key is lost or stolen. This will prevent unauthorized people from starting your car or stealing it. This method should work on any Mazda however, you'll require two working keys to begin the reprogramming process. If you don't have two keys that function, you should take your vehicle to a dealer to get this done.

Begin by getting in your driver's seat and close the door, with the exception for the one that's already opened. Place the first working key in the slot, then turn the ignition to ON. After five seconds, take the key out and repeat the process with the second working key.

Once you've completed programming your new key you should have 3 keys that work to start your vehicle in the future. Before saving each key, be sure it's functioning correctly.

It's a good idea to purchase a spare Mazda 3 key fob, Mazda 3 key especially if you're someone who has a tendency to lose their keys or has other issues with it. You can purchase one online or at a local automotive retailer, but make sure to read the reviews before buying so you can avoid getting a key fob that's not compatible with your vehicle.

How do you change the battery with a spare key?

It's very frustrating to discover that your key fob has died, and you are not able to unlock your vehicle. Fortunately, it's easy to replace the battery and save yourself some money at the dealership.

The first step is to press the auxiliary key button that is located on the back of the key fob. This will detach the key's metal cover and reveal a slot on each side of the case. The flathead should be inserted into one of these slots and gently pry the two halves of the case apart. When the battery is fully exposed, remove the case and put it in a place where you won't forget about it.

Before you begin, make sure that you have a new replacement battery. These batteries can be purchased at any store selling batteries or from a Mazda dealer in Winter Garden. Choosing the correct battery will ensure that your key fob functions effectively.

Next, put the replacement mazda key battery into place and replace the cap on the battery. Be careful not to scratch the small rubber ring that the battery sits on. Then press the two parts of the key fob until you hear an audible click.

How do you reset the Keyless Entry System

The Mazda 3 key fob is not just a convenience. It also serves as an element of security. The car won't start if the key is stolen or lost even if you have an extra fob. The key fob must be reset by the dealer to allow it to work again. This can be an expensive and stressful experience, so it's a good idea to learn how to reset the system yourself.

Disconnect the battery from the system for 15 minutes. This will take out any remaining electricity from the onboard computer. Next, mazda 3 Key disconnect both the LF-ECU and demand switch connectors. Then, check continuity between the following terminals:

Insert the key into the slot, then turn on the ignition. The key should remain in the ignition for around five seconds, and then switch it off. The key information is now stored in the car's computer and the new fob will start your vehicle. You can program as many fobs you desire, but only one should be used at any certain time. This will keep unauthorised individuals from stealing your key and gaining access to your car. You can purchase a new key fob on the internet, but you'll still need to go to an expert locksmith or dealer to cut it and programmed.