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

Whether you dropped your key fob on the floor or it simply stopped working, it's recommended to keep a spare key handy. This article will show you how to add, alter or reprogramme your Mazda 3 keyfobs.

Warning: Some keys require programming from an expert locksmith, while others don't. Be sure to only make use of official Mazda replacements for your key fob.

How do I add a spare key?

You can add a second key if you don't have a spare key or when you accidentally damage your existing one. You'll need the flathead screwdriver, as well as a new CR2025 battery. Once you have the items then it's time to open the key fob. Find the auxiliary key release. It's located on the underside of 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 in the notch at the top or in the space, and pry the metal part off.

Insert your new or spare key into the slot following the removal of the secondary 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 begin your vehicle in the future.

It's important to note that you can only program up to three keys for your Mazda 3. The last thing you want is to have more than two working key fobs but not be in a position to get your vehicle started. This is a safety precaution designed to stop unauthorized users, such as valet drivers, from activating your key and thereby launching your vehicle.

How to Reprogram a spare key

If you have a spare key it's a good idea know how to program it in the event the original key you had is stolen or lost. This will stop unauthorised people from stealing your car and starting it. This should work with any mazda key replacement. You will require two keys that work for the reprogramming to begin. If you don't have two working keys then it's best to bring your Mazda to a dealer to get this done.

Start by getting into the driver's position and close all the doors, except the one that is open. Put the first working key in the slot, and then turn the ignition to ON. After five seconds, remove the key and repeat with the second working key.

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

It's a good idea to buy a spare Mazda 3 key fob, especially if you're a driver who often loses your key or has other issues with it. You can purchase one on the internet or in your local auto store. Make sure you look up reviews before you purchase to ensure you don't buy 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 the key fob you used to use has gone out and you're locked out of your car. Luckily, it's easy to replace the battery and save yourself some money at the dealer.

Press the auxiliary key button located at the back of the keyfob. This will remove the metal key auxiliary to reveal a slot on both sides of the case. The flathead should be inserted into one of these slots and then gently pull the two halves apart. Once the battery is fully exposed, remove it and place the case somewhere you won't forget it.

Make sure you have a replacement battery prior to starting. You can find these at any retailer that sells batteries or at a Mazda dealer near Winter Garden. The right type of battery is essential to make sure that your keyfob functions properly.

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

How to Reset the system's Keyless Entry System

The key fob on your Mazda 3 is not only an added convenience, but it's also an important security feature. The car won't start if your key is lost or stolen even if you have an extra key fob. This is because the key fob needs to be reprogrammed by the dealership to work once more. This can be an expensive 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 eliminate any remaining electrical current from the computer on board. Then, disconnect both the LF-ECU and demand switch connectors. Check continuity between the following terminals.

Put the key in the slot, then switch the ignition on. Turn off the ignition after approximately five seconds. The key's details will be transferred to your vehicle's computer and the new fob will be able to start your vehicle in the future. You can program any number of fobs you would like but only one can be used at any given time. This will prevent unauthorized people from stealing your key and gaining access to your vehicle. You can purchase a new keyfob online, but it'll still need to be programmed and cut by a dealer.