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

If you've dropped your key fob on the floor or it has stopped working, it's an excellent idea to keep a spare key handy. This article will go over everything you must know about the process of adding, changing, and changing your Mazda 3 key fobs.

A word of warning: some keys require programming by a locksmith professional or dealer, while others don't. Make sure you only make use of official Mazda replacements for your key fob.

How to add a spare key

If you're not lucky enough to receive a spare keys from the dealership when you buy your Mazda 3 or accidentally break your current key, don't worry -- there is still a way to add another key. To do this, you'll need an inexpensive flathead screwdriver as well as an updated CR2025 battery. Once you've got these items, it is time to open the key fob. First look for the key release button for the auxiliary key. It's located on the underside of the metal part. It's easy to locate. When you hit the button, the back cover will fall off instantly. Then, put the screwdriver's head into the notch at the top or the space, and pry the metal part off.

After the auxiliary keys are removed, insert your new or spare key into the slot. Turn the ignition on and then wait for around 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 in your Mazda 3. You don't want to have to use more than two keys to start your car. This is a safety precaution designed to prevent unauthorized users, such as valet drivers from activating your key and starting your car.

How to Reprogram a spare key

It's smart to learn how you can reprogram an extra key in the event that your original key becomes lost or stolen. This will stop unauthorised people from starting your car, or stealing it. This method should work on any mazda key replacement however you'll need two keys working to begin the reprogramming process. If you don't have two working keys, you'll need to take your vehicle to a dealership to get it done.

Begin by getting into your driver's seat and close the door, with the exception for the one that's opened. Turn the ignition on and then insert the first working key. Wait five seconds, then remove the key and repeat the process with a second key.

After you finish programming your new key, you'll have 3 keys that will start your vehicle in the future. Test each key to be sure that they're operating correctly before taking them off.

It is advisable to purchase an extra Mazda 3 remote, especially when your car is susceptible to problems. You can buy one online or in your local auto store. Make sure to go through reviews prior to purchasing to ensure that you don't get a key fob which isn't compatible with your car.

How do I change the battery on a spare key?

It's a nightmare to discover that your key fob has failed, and you are locked out of your car. It's a good thing that it's simple to replace the battery and save some money at the dealer.

The first step is to press the auxiliary key button that is located on the back of the key fob. This will release 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 then gently pull the two halves of the case apart. When the battery is completely exposed, take it out and set aside the case somewhere safe from being lost.

Before you start, make sure you have a brand new replacement battery. These batteries can be purchased at any retailer that sells batteries or from a mazda key fob dealer in Winter Garden. Using the right type of battery will ensure that your key fob operates perfectly.

Next, put the new battery in place and replace the battery cap. Be careful not to scratch the rubber ring that holds the battery. Finally, press the two halves of the key fob until you hear an audible click.

How do I reset a Keyless Entry System

The Mazda 3 key fob is not just a practical feature. It also serves as a security measure. The car won't start if the key is stolen or lost, even if you've got a spare key fob. This is because the fob that you have to be reprogrammed at the dealership to function properly. It can be a stressful and costly process. So, it's best to learn how to reset the system.

To reset the system, unplug the battery for around 15 minutes. This will eliminate any residual 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, place it in the slot and set the ignition to ON. Leave the key in for about five seconds and then switch off. The key information will now be added to the vehicle's computer and the new fob will be able start your car in the future. You can program up to three fobs however, you should only use one at a time. This will keep unauthorised individuals from stealing your key and gaining access to your car. You can purchase a replacement key fob online, but you'll still need to go to a dealer or locksmith to get it cut and programmed.