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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 a good idea to have a spare key handy. This article will explain everything you need to be aware of when adding, changing, or changing your Mazda 3 key fobs.

Certain keys require programming from a professional locksmith, while others do not. Make sure to use official Mazda replacements for 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 available or if you accidentally damage the one you have. You'll need a flathead screwdriver, and the CR2025 replacement battery. Once you've got the tools then it's time to open the key fob. First look for the auxiliary key release button. The button is located beneath the metal portion. It's easy to find. The cover on the back should fall off as soon as you press the button. Next, insert the head of the screwdriver into the notch or space at the top of the metal part and then pull it off.

Insert your spare or new key into the slot after taking out the secondary key. Turn the ignition on and wait for approximately five seconds, then set it to off. This will add the new information on the key to the system and allow it to start your car in the future.

It's important to note that you can only program up to three keys on your Mazda 3. The final thing you want is to have more than two functioning key fobs and not be in a position to get your car started. This is a safety measure designed to prevent unauthorized users, like valet drivers, from activating your key and starting your vehicle.

How do I reprogram a spare key

If you have a spare key, it's important to know how to reprogram it in case your original key gets stolen or lost. This will prevent unauthorized people from opening your car or stealing it. This should work with any Mazda. You will require two keys that are functioning for the reprogramming to begin. If you don't own two working keys, you'll need take your vehicle to the dealer to get it done.

Begin by stepping into the driver's position and shutting all doors, with the exception of the one that is open. Set the ignition to ON and insert the initial working key. After five seconds, remove the key. Repeat the process with the second key.

After you've programmed your new key, you should have three working keys that you can use to start your vehicle in the future. Before storing each key, make sure it's working properly.

It's a good idea to buy a spare Mazda 3 key fob, especially if you're a driver who frequently loses their key or has other issues with it. You can buy one online or at your local automotive retailer, but make sure to read reviews before purchasing so that you aren't buying the wrong key fob compatible with your vehicle.

How do I change the battery using a spare key

It's depressing to find out that your key fob has failed and you're not able to unlock your vehicle. It's easy to replace the battery yourself and save money at the dealer.

Press the auxiliary key button at the back of the keyfob. This will remove the key auxiliary and reveal slots on both sides of the case. Place the flathead in one of these slots, and then gently push the two halves apart. Once the battery is fully exposed, remove it and put it away somewhere safe from being lost.

Before you begin, make sure you have a new replacement battery. They are available at any store that stocks batteries or at an Mazda dealer near Winter Garden. The right type of battery is vital to ensure that your keyfob works properly.

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

How can I reset the Keyless Entry System

The key fob inside your Mazda 3 is not only an option for convenience, it's an important security feature. If you lost your key or had it stolen the car won't start, even if you have the spare key fob. The key fob must be reset by the dealer to make it work again. It's a difficult and costly experience. Therefore, it's recommended to learn how you can reset the system.

To reset the system, unplug the battery for 15 minutes. This will remove any residual electricity in the on-board computer. Then, disconnect both the LF-ECU and demand switch connectors. Then, check continuity between the following terminals:

Insert the key into the slot, and turn on the ignition. Keep the key in place for about five seconds, then switch it off. The key's information will be added 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 prevent unauthorised people from stealing your keys and getting access to your car. You can purchase a replacement keyfob from the internet, however it still needs to be cut and programmed by a dealer.