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

If you've dropped your key fob on the ground or it just stopped working, it's best to have a spare key on hand. This article will cover everything you must know about adding, changing, or reprogramming your Mazda 3 key fobs.

A word of caution: some keys require programming by a professional locksmith or dealer, whereas others don't. Only use authentic Mazda replacements to replace your key fob.

How to add an additional key

If you're not fortunate enough to receive a spare keys from the dealer when you purchase your Mazda 3 or accidentally break the one you have, don't worry -- there is still a way to add another key. You'll need to use an flat-head screwdriver and a new CR2025 battery. Once you've got the tools you can access the key fob and replace the battery. Find the key release auxiliary. It's located under the metal piece and is easy to find. Once you press the button, the cover should slide off immediately. Then, insert the screwdriver's head into the notch at the top or the space, and pull the metal piece off.

Once the auxiliary key has been removed, insert the new or spare key into the slot. Set the ignition to ON, and wait for about five seconds before setting it to OFF. This will add the new key's information to the system, allowing it to start your car in the future.

It is only possible to program three keys into your Mazda 3. The last thing you want is to have more than two working key fobs and not being capable of getting your vehicle started. This is a safeguard to stop anyone who is not authorized from activating your keys and launching your car.

How do I reprogram an unrepaired key?

It's a smart idea to learn how you can reprogram a spare key in the event that the original key is lost or stolen. This will keep unauthorised persons from opening your car or taking it. This process should work on any mazda car key replacement however you'll need two working keys to start the reprogramming. If you don't have two keys that function then it's best to bring your car to a dealer to get this done.

Begin by getting in your driver's seat and close the door, except for the one that's opened. Turn the ignition on and insert the first working key. After five seconds, remove the key. Repeat the process with the second key.

After you've completed programming your new key, you should have three keys that you can use to start your car in the future. Test each key to ensure sure that they're functioning properly before throwing them away.

It's a good idea buy a spare Mazda 3 key fob, especially if you're someone who frequently loses their key or has other issues with it. You can purchase one online or at a local automotive store. Make sure you read reviews before purchasing so that you don't get one that's not compatible with your vehicle.

How to change the Battery on a spare key

It's awful to discover that your key fob is dead and you're not able to unlock your vehicle. Fortunately, it's easy to replace the battery and save some money at the dealership.

The first step is to press the auxiliary key button on the back of the key fob. This will remove the key's metal cover and reveal the slots on both sides of the case. Put the flathead into one of these slots and then gently pry the two halves of the case apart. When the battery is completely exposed, remove it and place the case in a place where you will not forget it.

Be sure to have a new battery ready prior to starting. These batteries can be purchased from any store that sells batteries or from a Mazda dealer in Winter Garden. The correct battery is crucial to make sure that your keyfob functions correctly.

Then, put the new battery in the correct place and replace the battery cap. Be careful not to damage the rubber ring on which the battery rests. Finally, press the two parts of the key fob until you hear the sound of a click.

How to reset a 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 the key is stolen or lost even if you have a spare key fob. The key fob should be reset by the dealer to enable it to function again. It can be a stressful and costly ordeal. Therefore, it's advisable to learn how you can reset the system.

Disconnect the battery from the system for 15 minutes. This will eliminate any remaining electricity from the on-board computer. Then, disconnect both the LF-ECU connector and the demand switch connectors. Verify the continuity between the next terminals.

To program an entirely new key or spare, place it in the slot and turn the ignition to ON. Keep the key in place for about five seconds and then switch it off. The key's details are now added to the vehicle's computer and the new fob will start your vehicle. You can program as many fobs as need, but only one should be utilized at any given time. This will stop unauthorized individuals from stealing your keys and getting access to your vehicle. You can purchase a brand new keyfob online, but it'll still need to be programmed and cut by a dealer.