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

It's a good idea always to keep an extra key on hand, whether you dropped your keyfob, or it stopped working. This article will explain how to add, modify or reprogramme your Mazda 3 keyfobs.

Be aware that some keys require programming from a professional locksmith, while others don't. Make sure mazda replacement key cost make use of official Mazda replacements for your key fob.

How do I add a spare key?

If you're not lucky enough to find a spare key from the dealership when you buy your Mazda 3 or accidentally break your current one but don't worry, there's an option to get another key. To do this, you'll need an inexpensive flathead screwdriver as well as the new CR2025 batteries. Once you've got all the equipment you need, it's time to open the key fob. Locate the auxiliary key release. The button is located beneath the metal part. It's easy to locate. The cover that covers the back should come off as soon as you press the button. Then, put the screwdriver's head into the notch on top or in the space, and take the metal part away.

Insert your spare key or a new one into the slot after taking out the additional key. Turn the ignition on and wait for approximately five seconds, and then turn it to off. This will register the new key's details to the system, allowing it to start your car in the future.

It's important to keep in mind that you can only program up to three keys on your Mazda 3. You don't want to use more than two key fobs in order to start your car. This is a precautionary measure to prevent unauthorized users from activating your keys and launching your vehicle.

How do I reprogram an unrepaired key?

It's a smart idea learn how you can reprogram a spare key in the event that your original key is lost or stolen. This will stop unauthorized persons from starting your vehicle or stealing it. This should work with any Mazda. You will need two keys that are working to begin the reprogramming process. If you don't have two functioning keys, you'll need bring your vehicle to the dealership to complete the process.

Start by getting into the driver's position, and close all the doors, except the one that is open. Insert the first working key in the slot, and then set the ignition to the ON position. Wait five seconds before removing the key. Repeat with the second key.

After programming your new key, you'll have three keys that be able to start your car in the future. Before saving each key, be sure it's functioning correctly.

It is advisable to purchase an extra Mazda 3 remote, especially when your car is susceptible to problems. You can buy one online or at your local automobile retailer, but make sure to read the reviews before buying so that you aren't purchasing one that's not compatible with your car.

How do I change the battery on a Spare Key

It's awful to discover that your key fob has failed and you're unable to unlock your car. It's simple to replace the battery yourself and save money at the dealer.

Press the auxiliary button on the back of the keyfob. This will remove the key auxiliary to reveal slots on both sides of the case. The flathead should be inserted into one of these slots and then gently pry the two halves of the case apart. When the battery is fully exposed, take it out of the case and place it in a place where you won't forget about it.


Before you start, make sure that you have a new replacement battery. You can purchase them at any store that stocks batteries or at an Mazda dealer near Winter Garden. The correct battery is essential to make sure that your keyfob functions correctly.

Replace the cap on the battery, and then insert the new battery. Be careful not to damage the rubber ring on which the battery rests. Press the two halves together until you hear the click.

How do you reset the Keyless Entry System

The key fob on your Mazda 3 is not only an added convenience, but it's also an important security feature. If you lose your key or had it stolen the car won't start even if it has the spare key fob. This is because the key fob needs to be reset at the dealership to function properly. It can be a frustrating and costly ordeal. So, it's best to know how to reset the system.

Remove the battery from the system for 15 minutes. This will remove any remaining power from the on-board computer. Then, disconnect the LF -ECU and demand switch connectors. Check for continuity between the following terminals:

To program the new key or spare, insert it into the slot and set the ignition to ON. Turn off the ignition after about five seconds. The information from the key will be saved to your car's computer and the new fob will be able to start your vehicle in the future. You can program up to three fobs but you should only use one at each time. This will stop unauthorized individuals from stealing your key and gaining access to your vehicle. You can purchase a new key fob online, however you'll still have to visit an expert locksmith or dealer to have it cut and programmed.

Homepage: https://www.autokeys-r-us.co.uk/mazda/