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

It's a good idea always to keep an extra key in your pocket, whether you dropped your keyfob, or it has stopped working. This article will provide everything you must be aware of changing, adding, and programming your Mazda 3 key fobs.

A word of caution Some keys require programming by a professional locksmith or dealer, while others do not. Use only genuine Mazda replacements to replace your key fob.

How to Add a Spare Key

If you're unable to find a spare key from the dealership when you purchase your Mazda 3 or accidentally break your current key do not fret -- there's still an option to make another key. You'll need to use a flathead screwdriver, and a new CR2025 battery. Once you have the items and tools, you're ready to open the key fob. First, locate the auxiliary key release button. The button is beneath the metal part. It's easy to find. When you hit the button, the back cover should fall off right away. Then, insert the screwdriver's head in the notch on top or the space and take the metal part away.

Insert your spare key or a new one into the slot after taking out the accessory key. Set the ignition ON and wait for approximately five seconds, and then turn 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 to your Mazda 3. You don't want to have to utilize more than two keys to start your car. This is a security measure to stop unauthorised users from activating your keys and launching your vehicle.

How to reprogram an unrepaired key?

If you have a spare key, it's best to be aware of how to reprogram it in case your original key is lost or stolen. This will prevent unauthorized people from starting your car or taking it. This should work with any Mazda. You will require two keys that are working to begin the reprogramming. If you don't own two keys that function it's recommended to take your car to a dealer to get this done.

Begin by putting yourself in the driver's seat and closing the door, except for the one that's opened. Set the ignition to ON and insert the first working key. Take five seconds before removing the key. Repeat the process with the second key.

After you finish programming your new key, you should have three keys that start your car in the future. Before placing each key in storage, make sure that it's functioning properly.

You should think about purchasing an extra Mazda 3 remote, especially in the event that your vehicle is prone to problems. You can purchase one on the internet or at your local auto store. Make sure to read reviews before purchasing to ensure you don't buy 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 has failed, and you are not able to unlock your car. It's easy to replace the battery yourself and save money at the dealer.

The first step is to press the auxiliary key button on the back of the key fob. This will detach the key from the metal and reveal the slots on both sides of the case. Press the flathead screwdriver into one of these slots. Then, gently break the two sides of the case. When the battery is fully exposed, remove the case and put it somewhere that you will not forget it.

Be sure to have a new battery ready before you begin. They can be found at any retailer that sells batteries or at a Mazda dealer close to Winter Garden. Choosing the right battery will ensure that your key fob functions perfectly.

Replace the battery cap and then replace mazda key the battery. Be careful not to scratch the rubber ring on which the battery rests. The two halves should be pressed together until you hear a click.

How to Reset the system's Keyless Entry System

The key fob inside your Mazda 3 is not only an extra convenience, but also an important security feature. The car won't start if your key is lost or stolen even if you have a spare fob. The key fob needs to be reprogrammed by the dealer to allow it to work again. It can be a costly and time-consuming process therefore it's a great idea to learn how to reset the system yourself.

To reset the system, disconnect the battery for about 15 minutes. This will take out any remaining electricity from the onboard computer. Then, disconnect both connectors for the LF-ECU and the demand switch connectors. Check continuity between the following terminals.

Insert the key into the slot, then switch on the ignition. Put the key in for about five seconds and then switch it off. The key's information has been stored in the car's computer and the new fob is able to start your car. You can program up to three fobs, however, you should only use one at each time. This will keep unauthorised individuals from stealing your keys and getting access to your car. You can purchase a brand new key fob on the internet, but you'll still have to visit an authorized locksmith or dealer to have it cut and programmed.