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

If you've dropped your key fob on the ground or it just stopped working, it's always best to have an extra key available. This article will tell you how to add, alter and re-programme your mazda 3 spare key 3 keyfobs.

A word of warning Certain keys require programming by a professional locksmith or dealer, while other keys don't. Make sure you only use genuine Mazda replacements for Mazda 3 Spare Key your key fob.

How do I add a spare key

You can also add an additional key in case you don't have a spare key available or if you accidentally break your existing one. To accomplish this, you'll require a small flathead screwdriver and an updated CR2025 battery. Once you've got these tools then it's time to access the key fob to change the battery. First find the key release button for the auxiliary key. It's located on the underside the metal part. It's easy to locate. The back cover should slide off as soon as you press the button. Then, you can insert the screwdriver's head into the notch or spacing on the top of the metal component and pry it off.

Once the auxiliary key is removed, insert the new or spare key into the slot. Turn on the ignition and wait for approximately 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 on your Mazda 3. The one thing you don't want is to have more than two working key fobs but not be in a position to get your car started. This is a precautionary measure to stop unauthorized users from activating your keys and launching your vehicle.

How do you reprogram a spare key

If you have a spare key it's a good idea to be aware of how to program it in the event your original key is lost or stolen. This will stop unauthorized persons from stealing your car and starting it. This process is compatible with any Mazda but you'll need two working keys to start the process of reprogramming. If you don't own two keys that function, you should take your vehicle to a dealer to have this done.

Start by stepping into the driver's seat, close all the doors with the exception of the one that is open. Set the ignition to ON and insert the initial working key. After five seconds, remove the key. Repeat with the second key.

After programming your new key, you'll have three keys that be able to start your vehicle in the future. Check each key to make sure that they're functioning properly before putting them away.

It is advisable to purchase a spare Mazda 3 remote, especially if your car is prone to problems. You can purchase one online or in your local automotive store. Be sure to go through reviews prior to purchasing 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

There's nothing worse than discovering that the battery in your key fob has failed and you are unable to unlock your vehicle. Luckily, it's easy to replace the battery and save some money at the dealer.

Press the auxiliary button on the back of the keyfob. This will remove the metal key auxiliary and reveal slots on both sides of the case. Put the flathead screwdriver in one of these slots. Then, gently take apart the two parts of the case. Once the battery is fully exposed, take it out and put it away in a place where you will not forget it.

Before you begin, be sure you have a new replacement battery. They can be found at any retailer that sells batteries or at an Mazda dealer close to Winter Garden. Using the right type of battery will ensure that your key fob operates properly.

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

How to Reset the Keyless Entry System

The key fob in your Mazda 3 is not only an added convenience, but it's also an important security feature. The car won't start if the key is lost or stolen even if you have a spare fob. This is because the key fob needs to be reset at the dealership to function properly. It can be a costly and stressful experience therefore it's a great idea to learn how to reset the system yourself.

To reset the system, unplug the battery for around 15 minutes. This will eliminate any residual electrical current from the computer on board. Then, disconnect both LF-ECU and demand switch connectors. Then, check continuity between the following terminals:

Insert the key into the slot, then turn the ignition ON. Put the key in for around five seconds and then switch it off. The key's information has been transferred to the computer of your vehicle and the new fob will start your car. You can program as many fobs as would like however only one must be used at any certain time. This prevents unauthorized people from copying your key and gaining access to your vehicle. You can purchase a new keyfob on the internet, but it will still need to be programmed and cut by a dealer.