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

It's a good idea always to keep a spare key on hand no matter if you've dropped your keyfob, or it was unable to function. This article will teach you how to add, modify, and reprogramme your Mazda 3 keyfobs.

Be aware that some keys require programming from a professional locksmith, while others do not. Only use authentic Mazda replacements to replace your key fob.

How do you add an extra key

If you're not lucky enough to find a spare key from the dealership when you buy your Mazda 3 or accidentally break the one you have but don't worry, there is still a way to add another key. You'll need to use the flathead screwdriver, as well as an CR2025 battery. Once you've got all the equipment then it's time to open the key fob. Locate the key release auxiliary. It's on the underside of the metal part and is easy to find. When you press the button, the back cover should slide off immediately. Then, place the screwdriver's tip into the notch at the top or the space, and pry the metal part off.

After the auxiliary keys are removed, insert your new or spare key into the slot. Turn on the ignition and then wait for around five seconds, and then turn it to off. This will register the new information on the key to the system, allowing it to start your vehicle in the future.

It's important to note that you can only program up to three keys on your Mazda 3. You don't want to have to use more than two key fobs in order to start your car. This is a safety precaution designed to prevent unauthorized users, like valet drivers from activating your key and thereby starting your car.

How to Reprogram a spare key

If you have a spare key it's a good idea be aware of how to program it if the original key you had is stolen or lost. This will stop unauthorized persons from starting your car or taking it. This process should work on any mazda 3 key fob replacement however, you'll require two keys that work to begin the process of reprogramming. If you don't own two keys that work, you should take your Mazda to the dealer to get this completed.

Begin by stepping into the driver's seat, close all the doors, except the one that is open. Place the working key into the slot, then set the ignition to ON. Take five seconds before removing the key. Repeat the process with the second key.

After programming your new key, you'll have three keys that allow you to start your vehicle in the future. Test each key to ensure sure that they're working properly before throwing them away.

You should think about purchasing an extra Mazda 3 remote, especially in the event that your vehicle is prone to issues. You can buy one online or at your local auto store. Make sure to review the reviews before buying so that you don't get the wrong key fob that isn't compatible with your vehicle.

How do you change the battery with a spare key?

There's nothing more frustrating than discovering that the battery on your key fob failed and you are unable to unlock your vehicle. Fortunately, it's easy to replace the battery and save yourself some cash at the dealership.

The first step is to press the auxiliary key button located on the back of the key fob. This will remove the metal key auxiliary to reveal two slots on the sides of the case. The flathead should be inserted into one of these slots and then gently push the two halves apart. Once the battery is fully exposed, take it out and set aside the case in a place where you will not forget it.

Before you begin, be sure you have a new replacement battery. You can purchase them at any store that sells batteries or at a Mazda dealer near Winter Garden. The right kind of battery is essential to ensure that your key fob functions correctly.

Next, put the new battery in the correct place and replace the battery cap. Be careful not to scratch the small rubber ring that the battery sits on. Finally, press the two parts of the key fob together until you hear an audible click.

How to Reset the system's Keyless Entry System

The Mazda 3 key fob is not just a convenient feature. It's also a security measure. If you lose your key, or have it stolen, the car will not start even if you have the spare fob. The key fob has to be reprogrammed by a dealer to make it work again. It can be a stressful and costly experience. Therefore, it's recommended to know how to reset the system.

Remove the battery from the system for 15 minutes. This will eliminate any residual power from the on-board computer. Then, disconnect both LF-ECU connector as well as the demand switch connectors. Verify the continuity between the next terminals.

Insert the key into the slot and switch on the ignition. The key should remain in the ignition for around five seconds and then switch off. The key's details will be transferred to your vehicle's computer, and the new fob will be able to start your car in the future. You can program up to three fobs, but you should only use one at one time. This prevents unauthorized people from copying your key and getting ahold of your car. You can buy a new keyfob from the internet, however it will still need to be cut and programmed by a dealer.