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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 stopped working, it's always a good idea to have a spare key handy. This article will explain everything you must be aware of when adding, changing, or changing your Mazda 3 key fobs.

A word of caution: some keys require programming by a locksmith professional or dealer, while others don't. Use only official Mazda replacements to replace your key fob.

How to add a spare key

You can add an additional key if you don't have a spare key, or if you accidentally damage the one you have. You'll need a flathead screwdriver, and a CR2025 new battery. Once you've got the tools and tools, you're ready to open the key fob. Find the auxiliary key release. It's located underneath the metal piece and is easy to locate. Once you press the button, the cover will fall off instantly. Next, place the screwdriver's head into the notch or the space on the top of the metal piece and pull it off.

Once the auxiliary key is removed, insert your new or spare key into the slot. Turn on the ignition and wait for five seconds, and then turn it to OFF. This will allow the system to recognize the new key and begin your vehicle in the future.

You can only program three keys into your Mazda 3. The most important thing is to have more than two working key fobs, and not be in a position to get your vehicle started. This is a security measure designed to prevent unauthorised users, such as valet drivers from activating your key and thereby starting your car.

How to Reprogram a Spare Key

It's a good idea to know how you can reprogram a spare key in the event that your original key becomes lost or stolen. This will stop unauthorized persons from stealing your car and starting it. This should work with any Mazda. You'll need two keys that work to begin the reprogramming. If you don't own two working keys, you'll have to take your vehicle to the dealer to get it done.

Begin by stepping into the driver's seat and closing all the doors except the one that is open. Set the ignition to ON and insert the first working key. After five seconds, remove the key. Repeat with the second key.

After you've programmed your new key, you should have three working keys that you can use to start your car in the future. Before storing each key, make sure it's working properly.

You should consider buying an extra Mazda 3 remote, especially when your car is susceptible to issues. You can buy one online or at your local auto 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 car.

How to change the Battery on a spare Key

It's depressing to find out that your key fob has died, and you are unable to unlock your vehicle. mazda 6 key fob to change the battery yourself and save money at the dealership.

Press the auxiliary button on the back of the keyfob. This will release the metal auxiliary key and expose a slot on both sides of the case. The flathead should be inserted into one of these slots, and then gently push the two halves of the case apart. When the battery is completely exposed, take it out and set aside the case somewhere you won't forget it.

Be sure to bring an additional battery prior to beginning. These batteries can be purchased at any store that sells batteries or from a Mazda dealer in Winter Garden. The correct battery is crucial to make sure that your keyfob functions correctly.

Then, place the new battery in its place and then replace the cap on the battery. Be careful not to scratch the small rubber ring that the battery sits on. Then, press the two halves of the key fob until you hear the sound of clicking.

How to reset a Keyless Entry System

The Mazda 3 key fob is not just a convenient feature. It's also a security measure. The car will not start if the key is lost or stolen even if you have a spare key fob. The key fob has to be reset by the dealer to make it work again. This could be a costly and time-consuming process, so it's a good idea to learn how to reset the system yourself.

To reset the system, remove the battery for about 15 minutes. This will remove any residual electrical power in the on-board computer. Then, disconnect both connectors for the LF-ECU and the demand switch connectors. Then, check continuity between the following terminals:

Place the key in the slot, and turn the ignition ON. Switch off the ignition after approximately five seconds. The key information is now transferred to the computer of your vehicle and the new fob will start your car. You can program any number of fobs you would like, but only one should be used at any given time. This will stop unauthorised people from copying your key and gaining access to your car. You can purchase a new key fob online, however you'll still have to visit an authorized locksmith or dealer to cut it and programmed.


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