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

Whether you dropped your key fob on the ground or it simply stopped working, it's always recommended to keep an extra key in your pocket. This article will explain everything you need to be aware of the process of adding, changing, and reprogramming your Mazda 3 key fobs.

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

How do I 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 do not fret -- there's still an option to get another key. To accomplish this, you'll need a small screwdriver with a flat head and an CR2025 battery that's new. Once you have these items and are ready to access the key fob and replace the battery. First look for the key release button for the auxiliary key. It's located under the metal part and is easy to locate. The cover on the back should fall off when you press the button. Next, insert the head of the screwdriver into the notch or spacing at the top of the metal piece and pull it off.

Insert your new or spare key into the slot following the removal of the secondary key. Set the ignition ON and wait for five seconds, then set it to OFF. This will allow the system to recognize the new key and start your vehicle in the future.

You can only program three keys to your Mazda 3. You don't want to use more than two key fobs to start your car. This is a security precaution designed to prevent unauthorised 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 best to be aware of how to program it in the event your original key gets lost or stolen. This will stop unauthorised people from opening your car or taking it. This process should work on any Mazda however you'll need two keys that work to begin the process of reprogramming. If you don't have two working keys, it's best to take your Mazda to a dealer to get this completed.

Begin by getting into your driver's seat and close the door, with the exception for the one that's open. Insert the first working key in the slot, then turn the ignition to the ON position. Wait five seconds, then take the key out and repeat the process with a second key.

Once you've finished programming your new key, you should have three keys that you can use to start your vehicle in the future. Before placing each key in storage, make sure that it's functioning properly.

It's a good idea to buy an extra mazda key fob replacement 3 key fob, particularly if you're a driver who often loses your key or has other issues with it. You can purchase one online or at your local auto 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 car.

How to change the battery with a spare key?

It's awful to discover that the key fob you used to use has gone out and you're in a position to not unlock your car. It's a good thing that it's simple to replace the battery and save some money at the dealership.

The first step is to press the auxiliary key button that is located on the back of the key fob. This will take out the key's metal cover and reveal the slots on both sides of the case. The flathead should be inserted into one of these slots, and then gently push the two halves apart. When the battery is completely exposed, remove it and place the case somewhere safe from being lost.

Before you begin, make sure you have a brand new replacement battery. You can purchase them at any retailer that sells batteries or at a Mazda dealer near Winter Garden. Choosing the correct battery will ensure that your key fob works perfectly.

Replace the cap on the battery and then replace the battery. Be careful not to scratch the small rubber ring the battery rests on. Finally press the two parts 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 will not start if the key is stolen or lost even if you have a spare key fob. This is because the key fob needs to be reset at the dealership to work properly. It can be a frustrating and expensive ordeal. Therefore, it's advisable to learn how you can reset the system.

To reset the system, disconnect the battery for 15 minutes. This will remove any remaining electrical current from the computer on board. The next step is to disconnect the LF-ECU and demand switch connectors. Verify the continuity between the next terminals.

Put the key in the slot and switch the ignition on. Leave the key in for around five seconds, and then turn it off. The key's information has been added to the computer in your car and the new fob will start your vehicle. You can program as many fobs as need but only one can be in use at any particular time. This will stop unauthorised people from copying the key and getting ahold of your vehicle. You can purchase a replacement keyfob from the internet, however it must be programmed and cut by an authorized dealer.