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

It's a good idea to have an extra key at hand in case you lose your keyfob, or it stopped working. This article will explain everything you need to be aware of the process of adding, changing, and changing the programming of your Mazda 3 key fobs.

A word of warning Certain keys need to be programmed by a locksmith professional or dealer, while others do not. Make sure to use genuine Mazda replacements for your key fob.

How do I add a spare key?

You can add another key in the event that you don't have a spare key, or if you accidentally damage the one you already have. To accomplish this, you'll require a small flathead screwdriver and an updated CR2025 battery. Once you've got the tools then it's time to open the key fob. Locate the key release auxiliary. It's located on the underside of the metal component and is easy to find. When you press the button, the back cover should slide off immediately. Next, insert the screwdriver's head into the notch or space at the top of the metal piece and pull it away.

Insert the spare or new key into the slot following the removal of the accessory key. Set the ignition to ON, and wait 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 is only possible to program three keys in your Mazda 3. The last thing you want is to have more than two working key fobs and not being in a position to get your vehicle started. This is a safety measure designed to prevent unauthorized users, such as valet drivers from activating your key and starting your car.

How to reprogram an unrepaired 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 prevent unauthorized people from starting your car, or stealing it. This procedure should work with any Mazda however, you'll require two working keys to begin the reprogramming process. If you don't have two keys that work then it's best to bring your car to a dealer to have this completed.

Start by stepping into driver's position, and close all the doors, except the one that is open. Place the working key in the slot, then set the ignition to ON. Wait five seconds, then take the key out and repeat the process with the second working key.

After you've programmed your new key, you'll have three keys that you can use to start your car in the future. Check each key to make sure that they're functioning properly before placing them away.

It is advisable to purchase a spare Mazda 3 remote, especially when your car is susceptible to issues. You can purchase one on the internet or in your local automotive store. Make sure you go through reviews prior to purchasing to ensure that you don't purchase one that's not compatible with your car.

How to change the Battery on a Spare Key

It's a nightmare to discover that your key fob is dead, and you are not able to unlock your car. It's easy to change the battery yourself and save money at the dealership.

The first step is to press the auxiliary button on the back of the key fob. This will remove the metal 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 gently pry the two halves apart. When the battery is completely exposed, take it out and put it away in a place where you will not forget it.

Be sure to bring an extra battery in place before you begin. They can be bought at any retailer that sells batteries or from a Mazda dealer in Winter Garden. The right type of battery is essential to ensure that your key fob functions properly.

Next, put the replacement mazda key battery in its place and then replace the cap of the battery. Be careful not to damage the small rubber ring that the battery sits on. Press the two halves together until you can hear the click.

How do I reset a Keyless Entry System

The key fob on your Mazda 3 is not only an option for convenience, programmed it's an important security feature. If you lost your key or had it stolen the car will not start even if it has the spare fob. This is because the key fob has to be reprogrammed at the dealership in order to work again. This can be an expensive and time-consuming process therefore it's a great idea to understand how to reset the system yourself.

Disconnect the battery from the system for 15 minutes. This will remove any residual electrical current from the computer on board. Next, disconnect the LF-ECU and demand switch connectors. After that, test for continuity between the following terminals:

To program a new key or a spare, place it in the slot and turn the ignition to ON. The ignition should be turned off after approximately five minutes. The key information will now be saved to your car's computer and the new fob will be able to start your car in the future. You can program as many fobs as desire however only one must be in use at any particular time. This will prevent unauthorized persons from copying the key and getting ahold of your vehicle. You can purchase a replacement key fob online, programmed however you'll still need to visit a dealer or locksmith to cut it and get it programmed.