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

It's a good idea to have a spare key on hand in case you lose the keyfob you were using or it has stopped working. This article will provide everything you must know about adding, changing, and programming your Mazda 3 key fobs.

Note: Some keys require programming by an experienced locksmith, whereas others don't. Make sure you use only genuine Mazda replacements to replace your key fob.

How to add an additional key

You can add an additional key if you don't have a spare key available or if you accidentally break your existing one. You'll need a flathead screwdriver and the CR2025 replacement battery. Once you've got the tools you can open up the key fob to change the battery. Find the key release auxiliary. The button is on the underside of the metal portion. It's easy to locate. The back cover should come off as soon as you press the button. Next, place the head of the screwdriver into the notch or space on the top of the metal piece and then pull it off.

Once the auxiliary key is removed, insert the new or spare key into the slot. Set the ignition to ON and wait for around five seconds before setting it to off. This will register the new information on the key to the system, allowing it to start your car in the future.

You can only program three keys into your Mazda 3. The one thing you don't want is to have more than two functioning key fobs, and not be able to get your car started. This is a precautionary measure to stop anyone who is not authorized from activating your keys and then starting your car.

How do I reprogram a spare key?

If you have a spare key, it's a good idea be aware of how to program it if your original key gets stolen or lost. This will keep unauthorised persons from starting your vehicle or taking it. This method should work on any Mazda but you'll need two working keys to start the process of reprogramming. If you don't have two keys that function then it's best to bring your mazda keys to the dealer to have this done.

Start by getting into the driver's seat and close all the doors, except the one that is open. Set the ignition to ON and then insert the first working key. For five seconds, take the key out and repeat the procedure with the second working key.

Once you've completed programming your new key you should have 3 keys that will work to start your car in the future. Before you store each key, make sure it's working properly.

You should think about purchasing a spare mazda cx-5 key replacement cost 3 remote, especially in cases where your car is prone to issues. 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 the wrong key fob that isn't compatible with your vehicle.

How to change the Battery on a spare key

It's awful to discover that the key fob you used to use has gone out and you're locked out of your car. It's a good thing that it's simple to replace the battery and save some cash at the dealership.

Press the auxiliary key button at the back of the keyfob. This will release the key's metal cover and reveal two slots on the opposite side of the case. Press the flathead screwdriver into one of these slots. Then, gently pry apart the two parts of the case. After the battery is fully exposed, take it out of the case and put it somewhere that you will not forget it.

Make sure you have an additional battery prior to starting. They are available in any store that sells batteries or at an duplicate mazda key fob dealer near Winter Garden. Using the right type of battery will ensure that your key fob operates effectively.

Next, put the replacement battery in its place and then replace the battery cap. Be careful not to scratch the small rubber ring the battery sits on. Then, press the two halves of the key fob until you hear an audible click.

How to Reset a Keyless Entry System

The Mazda 3 key fob is not just a convenient feature. It's also an element of security. The car won't start if your key is stolen or lost, even if you've got an extra fob. This is because the key fob has to be reprogrammed by the dealership to work properly. This could be a costly and time-consuming process, so it's a good idea to know how to reset the system yourself.

To reset the system, remove the battery for around 15 minutes. This will clear any residual electric current from the onboard computer. Then, disconnect the LF-ECU connector and the demand switch connectors. Check continuity between the following terminals.

Put the key in the slot, and turn the ignition ON. Stop the ignition after about five minutes. The key's information is stored in the car's computer and the new fob will start your vehicle. You can program as many fobs you need, but only one should be used at a specific time. This stops unauthorized individuals from copying the key and gaining access to your vehicle. You can buy a new key fob on the internet, but you'll still need to visit an authorized locksmith or dealer to get it cut and programmed.