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

It's a good idea always to keep a spare key on hand, whether you dropped your keyfob or it stopped working. This article will go over everything you must be aware of adding, changing, and reprogramming your Mazda 3 key fobs.

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

How to Add a Spare Key

If you're not lucky enough to receive a spare keys from the dealer when you buy your Mazda 3 or accidentally break your current key but don't worry, there's the option of adding another key. You'll need the flathead screwdriver, as well as a CR2025 new battery. Once you've got all the equipment and tools, you're ready to open the key fob. First, locate the button that allows you to release the key. It's located underneath the metal part and is easy to locate. The back cover should come off when you press the button. Then, insert the screwdriver's head into the notch or space on the top of the metal piece and then pull it off.

After the auxiliary key has been removed, insert the new or spare key into the slot. Turn on the ignition and wait for five seconds before turning it to OFF. This will allow the system to recognize the new key and begin your vehicle in the future.

You can only program three keys on your Mazda 3. You don't want to use more than two key fobs to start your car. This is a security measure designed to prevent unauthorized users, such as valet drivers from activating your key and starting your car.

How to Reprogram a spare key

If you have a spare key, it's a good idea to know how to reprogram it in the event that the original key you had is lost or stolen. This will keep unauthorised persons from starting your vehicle or taking it. This should work with any mazda 3 key fob. You'll require two keys that are functioning to start the reprogramming process. If you don't own two working keys, you should take your vehicle to a dealer to have this completed.

Begin by getting in your driver's seat, and closing the door, except for the one that's open. Insert the first working key in the slot, and then set the ignition to ON. After five seconds, remove the key. Repeat with the second key.

Once you've completed programming your new key you should have three keys that will start your car in the future. Before you store each key, make sure that it's working correctly.

You should think about buying a spare Mazda 3 remote, especially in the event that your vehicle is prone to problems. You can purchase one on the internet or in your local automotive store. Be sure to look up reviews before you purchase so that you don't get the wrong key fob that isn't compatible with your vehicle.

How to Change the Battery on a spare key

It's a nightmare to discover that the key fob you used to use has gone out, and you are not able to unlock your car. It's not a problem to replace the battery and save yourself some money at the dealer.

Press the auxiliary key button on the back of the keyfob. This will release the metal auxiliary key and expose a slot on both sides of the case. Insert the flathead screwdriver into one of these slots. Then, gently take apart the two sides of the case. Once the battery is fully exposed, take it out and put it away somewhere safe from being lost.

Before you start, make sure you have a new replacement battery. You can purchase them at any store that sells batteries or at an Mazda dealer close to Winter Garden. The correct type of battery is crucial to ensure that your key fob functions correctly.

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

How do you reset the Keyless Entry System

The key fob in your Mazda 3 is not only a convenience, it's also an important security feature. The car won't start if your key is lost or stolen, even if you've got an extra key fob. The key fob needs to be reset by the dealer to allow it to work again. This can be an expensive and frustrating experience and it's a good idea to understand how to reset the system yourself.

Disconnect the battery from the system for 15 minutes. This will eliminate any remaining electricity from the on-board computer. Then, disconnect both the LF-ECU and demand switch connectors. Then, check continuity between the following terminals:

To program an entirely new key or spare, place it in the slot and set the ignition to ON. Stop the ignition after about five seconds. The key's information has been stored in the car's computer and the new fob will start your vehicle. You can program as many fobs as you need, but only one should be used at a specific time. This will stop unauthorised people from copying the key and getting ahold of your vehicle. You can purchase a new key fob on the internet, but you'll still have to visit an authorized locksmith or dealer to cut it and programmed.