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

It's a good idea to have an extra key on hand, whether you dropped the keyfob or it was unable to function. This article will cover everything you need to be aware of when adding, changing, or programming your Mazda 3 key fobs.

A word of caution Some keys require programming by a professional locksmith or dealer, whereas others don't. Make sure you only use official mazda 2 key replacements for your key fob.

How to Add a Spare Key

You can add a second key if you don't have a spare key or in the event that you break your current one. To accomplish this, you'll need a small flathead screwdriver and the new CR2025 batteries. Once you've got the tools you need, it's time to open the key fob. Locate the auxiliary key release. It's located underneath the metal piece and is easy to locate. The back cover should come off the moment you press the button. Then, insert the head of the screwdriver into the notch or spacing at the top of the metal part and pry it off.

Once the auxiliary key has been removed, insert the new or spare key into the slot. Set the ignition to ON and wait for about five seconds before setting it to OFF. This will allow the system to recognize the new key and start your vehicle in the future.

It's important to note 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 capable of getting your vehicle started. This is a security measure that is designed to block unauthorized users, like valet drivers, from activating your key and starting your car.

How do you reprogram an unrepaired key?

If you have a spare key, it's important to know how to reprogram it in case the original key you had is lost or stolen. This will keep unauthorised persons from starting your car, or taking it. This procedure should work with any Mazda but you'll need two working keys to begin the process of reprogramming. If you don't have the two working keys, you'll need take your vehicle to a dealership to complete the process.

Start by getting into the driver's seat and closing all the doors except the one that is open. Insert the first working key into the slot, then set the ignition to ON. For five seconds, take the key out and repeat the process with the second working key.

After you finish programming your new key, you should have 3 keys that will work to start your vehicle in the future. Before you store each key, make sure it's functioning correctly.

It's a good idea to purchase a spare mazda 2 key 3 key fob, particularly if you're a driver who is prone to losing keys or has other issues with it. You can purchase one online or at a local automotive store. Make sure you look up reviews before you purchase to ensure that you don't purchase a key fob which isn't compatible with your vehicle.

How to change the Battery on a spare key

It's depressing to find out that your key fob has failed, and you are in a position to not unlock your car. Luckily, it's easy to replace the battery and save yourself some cash at the dealership.

Press the auxiliary button on the back of the keyfob. This will remove the key that is used as an auxiliary key, and expose a slot on both sides of the case. Press the flathead into one of these slots, and then gently push the two halves of the case apart. When the battery is completely exposed, remove it and place the case somewhere safe from being lost.

Be sure to bring an additional battery prior to starting. They can be found in any store that sells batteries or at a Mazda dealer near Winter Garden. Choosing the right battery will ensure that your key fob functions effectively.

Next, put the new battery in the correct place and replace the battery cap. Be careful not to scratch the rubber ring on which the battery rests. Finally press the two parts of the key fob until you hear the sound of a click.

How to reset a Keyless Entry System

The Mazda 3 key fob is not just a convenience. It also serves as a security feature. If you lost your key or had it stolen, the car will not start, even if you have the spare key fob. The key fob must be reprogrammed by the dealer to allow it to work again. It can be a frustrating and expensive ordeal. So, it's best to understand how you can reset the system.

To reset the system, unplug the battery for around 15 minutes. This will erase any residual electricity in the on-board computer. Then, disconnect the LF-ECU and demand switch connectors. Verify the continuity between the next terminals.

Put the key in the slot and switch on the ignition. Keep the key in place for about five seconds, then switch off. The key information is now added to the computer in your car and the new fob can start your vehicle. You can program up to three fobs, however, you must only use one at a time. This will stop unauthorised people from copying the key and getting ahold of your car. You can purchase a replacement keyfob online, however it will still need to be cut and programmed by an authorized dealer.