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

It's a good idea always to have an extra key on hand, whether you dropped the keyfob or it was unable to function. This article will tell you how to add, change, and reprogramme your Mazda 3 keyfobs.

Certain keys require programming by an expert locksmith, while others do not. Make sure you only make use of official Mazda replacements for your key fob.

How to add a spare key

If you're not lucky enough to find a spare key from the dealership when you purchase your mazda key fob 3 or accidentally break the one you have, don't worry -- there's an option to get another key. You'll need to use the flathead screwdriver, as well as a CR2025 new battery. Once you have the items, it is time to open the key fob. First look for the auxiliary key release button. It's located on the underside of the metal piece and is easy to find. When you hit the button, the back cover should fall off right away. Then, put the screwdriver's head in the notch at the top or the space and pull the metal piece off.

Insert the spare or new key into the slot after removing the additional key. Set the ignition to ON and wait for around five seconds before turning it to OFF. This will allow the system to recognize the new key and start your vehicle in the future.

It is important to remember that you can only program up to three keys for your Mazda 3. The most important thing is to have more than two functioning key fobs and not be able to get your car started. This is a security measure that is designed to block unauthorized users, like valet drivers from activating your key and starting your vehicle.

How do I reprogram a spare key?

It's a smart idea to learn how you can reprogram an extra key in the event that your original key becomes lost or stolen. This will keep unauthorised persons from starting your vehicle or stealing it. This method should work on any Mazda however, you'll require two keys that work to begin the reprogramming process. If you don't have two working keys, you'll need to take your vehicle to a dealer to get it done.

Start by stepping into the driver's seat and shutting all doors, with the exception of the one that is open. Place the working key into the slot, then turn the ignition to the ON position. Wait five seconds before removing the key. Repeat the process with the second key.

After you've programmed your new key you should have 3 keys that work to start your vehicle in the future. Test each key to make sure that they're functioning properly before putting them away.

It's a good idea to purchase an extra mazda 2 key fob replacement 3 key fob, especially if you're a driver who is prone to losing keys or has other issues with it. You can buy one online or in your local automotive store. Be sure to look up reviews before you purchase so that you don't get an item that isn't compatible with your car.

How to change the battery on a spare key?

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

The first step is to press the auxiliary key button located on the back of the key fob. This will release the metal key auxiliary and reveal an opening on both sides of the case. Insert the flathead screwdriver into one of these slots, and gently take apart the two halves of the case. Once the battery is fully exposed, take it out of the case and place it in a place where you won't forget it.

Before you begin, make sure that you have a brand new replacement battery. They can be found at any store that stocks batteries or at an Mazda dealer near Winter Garden. The right kind of battery is vital to ensure that your keyfob works correctly.

Replace the cap on the battery, and then insert the new battery. Be careful not to damage the small rubber ring that the battery is placed on. Finally, press the two halves of the key fob together until you hear the sound of clicking.

How to reset a Keyless Entry System

The Mazda 3 key fob is not just a convenient feature. It also serves as a security measure. The car will not start if your key is stolen or lost, even if you've got an extra fob. The key fob has to be reprogrammed by the dealer to allow it to work again. This could be a costly and time-consuming process, so it's a good idea to know how to reset the system yourself.

To reset the system, unplug the battery for approximately 15 minutes. This will remove any remaining electricity from the on-board computer. Then, disconnect both LF-ECU connector and the demand switch connectors. Check continuity between the following terminals.

To program an entirely new key or spare, place it in the slot and turn the ignition to ON. The key should remain in the ignition for around five seconds, and then switch off. The key information is now transferred to the computer of your vehicle and the new fob can start your car. 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 car. You can purchase a brand new key fob online, however you'll still need to go to a dealer or locksmith to have it cut and programmed.