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

It's a good idea always to keep an extra key on hand no matter if you've dropped the keyfob you were using or it has stopped working. This article will explain how to add, change or reprogramme your Mazda 3 keyfobs.

A word of warning Certain keys need to be programmed by a professional locksmith or dealer, whereas others don't. Make sure you use only authentic Mazda replacements to replace your key fob.

How to Add a Spare Key

You can also add an additional key if you don't have a spare key, or if you accidentally break your current one. To do this, you'll need an inexpensive flathead screwdriver as well as the new CR2025 batteries. Once you've got the tools you can open up the key fob and replace the battery. First, locate the key release button for the auxiliary key. It's located under the metal portion and is easy to find. The back cover should come off the moment you press the button. Then, place the screwdriver's head into the notch at the top or in the space, and take the metal part away.

Insert your spare or new key into the slot after taking out the accessory key. Turn on the ignition and wait for about five seconds, then set it to OFF. This will allow the system to recognize the new key and begin your vehicle in the future.

It's important to keep in mind that you can only program up to three keys for your Mazda 3. You don't want to use more than two key fobs to start your vehicle. This is a security measure designed to stop unauthorized users, such as valet drivers from activating your key and starting your vehicle.

How to reprogram an unrepaired key?

If you have a spare key it's a good idea know how to open a mazda key fob to program it in the event the original key you had is lost or stolen. This will stop unauthorised people from stealing your car and starting it. This will work with any Mazda. You will need two keys that work to begin the reprogramming. If you don't have two functioning keys, you'll need bring your car to the dealer to get it done.

Begin by stepping into the driver's seat and close all the doors, except the one that is open. Set the ignition to ON and insert the first functioning key. Then wait five seconds before taking out the key. Repeat with the second key.

After you've completed programming your new key, you should have three keys that you can use to start your vehicle in the future. Check each key to make sure that they're working properly before taking them off.

It's a good idea buy an extra Mazda 3 key fob, especially if you're someone who is prone to losing keys or has other issues with it. You can buy one online or at your local auto store. Make sure you look up reviews before you purchase to ensure that you don't get a key fob which isn't compatible with your vehicle.

How to change the battery on a spare key

It's very frustrating to discover that your key fob is dead, and you are unable to unlock your vehicle. Fortunately, it's easy to replace the battery and save some cash at the dealership.

Press the auxiliary key button at the back of the keyfob. This will take out the metal key auxiliary and reveal two slots on the sides of the case. Insert the flathead screwdriver into one of these slots and gently pry apart the two parts of the case. Once the battery is fully exposed, remove it and put it away somewhere safe from being lost.

Be sure to bring a new battery ready before you begin. They are available at any retailer that sells batteries or at a Mazda dealer near Winter Garden. The correct battery is vital to make sure that your keyfob functions properly.

Next, put the replacement battery in its place and then replace the cap of the battery. Be careful not to damage the rubber ring on which the battery rests. Finally, press the two halves of the key fob together until you hear an audible click.

How to reset a Keyless Entry System

The Mazda 3 key fob is not just a convenience. It also serves as a security measure. The car won't start if the key is stolen or lost even if you have an extra key fob. This is because the fob that you have to be reprogrammed by the dealership to function properly. It can be a frustrating and costly ordeal. So, it's best to understand how you can reset the system.

Disconnect the battery from the system for 15 minutes. This will eliminate any remaining electrical current from the computer on board. Then, disconnect both the LF-ECU connector as well as the demand switch connectors. Verify that the connections are in good order between the terminals.

To program an entirely new key or spare, insert it into the slot and turn the ignition to ON. Stop the ignition after about five minutes. The key's information will be transferred to your vehicle's computer, and the new fob will be able start your car Key duplication service 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 vehicle. You can buy a new key fob online, however you'll still need to go to an authorized locksmith or dealer to have it cut and programmed.