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

It's a good idea always to keep an extra key on hand in case you lose the keyfob or it was unable to function. This article will cover everything you must know about adding, changing, or changing the programming of your mazda key fobs 3 key fobs.

Note: Some keys require programming from professional locksmiths, while others do not. Only use genuine Mazda replacements to replace 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 if you accidentally break your current one. You'll need a flathead screwdriver and an CR2025 battery. Once you've got these tools and are ready to remove the key fob and change the battery. Locate the auxiliary key release. It's located beneath the metal part. It's easy to locate. The back cover should slide off the moment you press the button. Next, place the head of the screwdriver into the notch or space on the top of the metal part and then pull it off.

After the auxiliary keys are removed, insert your new or spare key into the slot. Set the ignition ON and then 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.

You can only program three keys in your Mazda 3. The last thing you want is to have more than two functioning key fobs and not being in a position to get your vehicle started. This is a precautionary measure to prevent unauthorized users from activating your key fobs and starting your vehicle.

How do you reprogram a spare key

If you have a spare key, it's a good idea know how to reprogram it in case your original key is stolen or lost. This will stop unauthorized persons from starting your car or taking it. This will work with any Mazda. You'll need two keys that are working to start the reprogramming process. If you don't own two working keys then it's best to bring your car to a dealer to get this done.

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

Once you've programmed your new key, you'll have three keys that you can use to start your vehicle in the future. Before saving each key, be sure that it's working correctly.

It's a good idea purchase an extra Mazda 3 key fob, especially if your car is one who is prone to losing keys or has other issues with it. You can buy one online or at your local automobile store, but make sure to read reviews before buying so you aren't purchasing an item that isn't compatible with your vehicle.

How to change the Battery on a Spare Key

There's nothing more frustrating than discovering that your key fob battery has failed and you are unable to unlock your car. It's easy to replace the battery yourself and save money at the dealership.

The first step is to press the auxiliary key button located on the back of the key fob. This will remove the key auxiliary and reveal slots on both sides of the case. Use the screwdriver's flathead to push it into one of these slots, and gently remove the two parts of the case. Once the battery is fully exposed, remove it and place the case somewhere safe from being lost.

Before you start, make sure that you have a brand new replacement battery. They are available at any store that sells batteries or at an Mazda dealer near Winter Garden. The correct type of battery is crucial to ensure that your keyfob works properly.

Then, put the new battery in place and replace the cap on the battery. Be careful not damage the rubber ring on which the battery rests. Press the two halves together until you hear the click.

How to reset a Keyless Entry System

The key fob inside your Mazda 3 is not only an option for convenience, it's an important security feature. If you lose your key, or have it stolen the car will not start even if you have the spare key fob. This is because the key fob needs to be reset at the dealership to work again. This can be a costly and time-consuming process It's a good idea to understand how to reset the system yourself.

To reset the system, unplug the battery for around 15 minutes. This will eliminate any remaining electric current from the onboard computer. Then, disconnect both LF-ECU connector as well as the demand switch connectors. Check continuity between the following terminals.

To program an entirely new key or spare, place it in the slot and set the ignition to ON. Keep the key in place for around five seconds, and then switch it off. The key's details will be transferred to your vehicle's computer and the new fob will be able to start your car in the future. You can program up to three fobs, but you must only use one at one time. This stops unauthorized individuals from copying your key and gaining access to your car. You can buy a new keyfob on the internet, but it'll still need to be programmed and cut by an authorized dealer.