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

If you've dropped your key fob on the ground or it stopped working, it's always a good idea to have an extra key available. This article will provide everything you must be aware of changing, adding, and changing the programming of your Mazda 3 key fobs.

Warning: Some keys require programming from a professional locksmith, while others do not. Be sure to only make use of official Mazda replacements for your key fob.

How do I add a spare key?

You can also add a second key if you don't have a spare key or when you accidentally damage the one you have. To accomplish this, you'll need a small screwdriver with a flat head and an updated CR2025 battery. Once you have these items then it's time to open up the key fob and replace the battery. Find the auxiliary key release. It's located on the underside of the metal portion and is easy to find. The back cover should slide off the moment you press the button. Then, you can insert the screwdriver's head in the notch on top or the space, and remove the metal part.

After the auxiliary keys are removed, insert the new or spare key into the slot. Set the ignition ON and wait for five seconds, then turn it to OFF. This will add the new key's information into the system and allow it to start your car in the future.

It's important to note that you can only program up to three keys for your Mazda 3. You don't want to have to use more than two key fobs to start your vehicle. This is a safety precaution designed to prevent unauthorized users, like valet drivers who are not authorized to use your key and starting your car.

How do I reprogram a spare key?

It's a smart idea learn how you can reprogram an extra key in the event that your original key becomes lost or stolen. This will stop unauthorised people from taking your car and then starting it. This process should work on any mazda replacement key however, you'll require two working keys to begin the reprogramming process. If you don't have the two working keys, you'll have to take your vehicle to the dealership to complete the process.

Begin by putting yourself in the driver's seat, and close the door, with the exception for the one that's been opened. Insert the first working key into the slot, and then turn the ignition to the ON position. For five seconds, take the key out and repeat the procedure with the second key.

Once you've completed programming your new key, you'll have 3 keys that will start your car in the near future. Before saving each key, be sure it's functioning correctly.

It is advisable to purchase an extra Mazda 3 remote, especially in the event that your vehicle is prone to issues. You can find one online or at your local auto store, but be sure to read the reviews prior to purchasing so you aren't purchasing one that's not compatible with your car.

How do I change the battery on a spare key

It's depressing to find out that your key fob has died, and you are not able to unlock your vehicle. It's not a problem to replace the battery and save yourself some money at the dealer.

The first step is to press the auxiliary button on the back of the key fob. This will release the metal key and reveal an opening on each side of the case. Use the screwdriver's flathead to push it into one of these slots and gently break the two halves of the case. Once the battery is fully exposed, remove it and set aside the case somewhere safe from being lost.

Before you begin, make sure that you have a brand new replacement battery. They are available at any store that stocks batteries or at a Mazda dealer near Winter Garden. The right kind of battery is essential to ensure that your key fob functions properly.

Replace the battery cap and then insert the new battery. Be careful not to scratch the small rubber ring that the battery sits on. Finally, press the two halves of the key fob together until you hear an audible click.

How do I reset the system's Keyless Entry System

The key fob that you have in your Mazda 3 is not only an extra convenience, but also an important security feature. If you Lost Mazda 3 Key your key or had it stolen, the car will not start even if it has the spare fob. This is because the fob that you have to be reset at the dealership to work properly. This could be a costly and frustrating ordeal and it's a good idea to learn how to reset the system yourself.

Disconnect the battery from the system for 15 minutes. This will clear any residual electric current from the onboard computer. The next step is to disconnect the LF-ECU and demand switch connectors. Check for continuity between the following terminals:

To program an entirely new key or spare, place it in the slot and turn the ignition to ON. Put the key in for around five seconds and then switch it off. The key information is now added to the computer in your car and the new fob will start your vehicle. You can program up to three fobs but you should only use one at one time. This will keep unauthorised individuals from stealing your keys and gaining access to your car. You can purchase a new keyfob on the internet, but it will still need to be cut and programmed by an authorized dealer.