14 Smart Ways To Spend Left-Over Mazda 6 Key Fob Budget Changing the Battery in Your Mazda 3 Key Fob

There's nothing more frustrating than getting in your car after a long work day and discovering that your key fob battery is dead. This is a simple solution that can be accomplished at a big box retailer or hardware store.

The addition of a spare key fob to your Mazda 3 can be an cost-effective way to stay away from the hassle of being transported to a dealership and having them reprogram your keys.

Battery Replacement

Change the battery in the Mazda 3 key fob is an easy process that can do at home. But, it is best to replace the battery if it goes out of service, or if the key fob shows a message on the multi-information display stating, "Low key fob battery. Replace battery."

You'll need a flathead screwdriver, tape and patience to open the case. Find mazda 5 key fob replacement or notch in the bottom metal part of the Mazda 3's key fob and then insert the head of the screwdriver in it to remove the lower portion. Repeat the process for the top metal piece Be careful not to damage the rubber ring at the bottom of the case.

Once the fob case has been opened, you'll notice an opening on either side of the case that houses the battery. Start on one side of the case, and then gently push it open. Remove the old battery and put in the new CR2025 ensure that it's facing up to ensure the correct polarity. Install the cap on the battery the other side and attach both sides of your key fob case by pressing until they click.

After replacing the battery after replacing the battery, lock and unlock your doors to ensure whether the fob is working. If everything appears to be working then you're able to use the Mazda 3's remote features on the road again!

Pairing Issues

If your key fob has stopped working all of a sudden it could be because the transmitter inside the car has been damaged. This is usually a matter of an expert to repair it and may require a new replacement key fob.

If you have tried replacing the battery and reprogramming the key fob but did not resolve the issue it is possible that the chip in the key fob might be faulty. This could happen if the key fob has been dropped on hard surfaces and exposed to salt water, or even touched by dirty hands.


You will need to locate the small "key" that is built into the seam to remove the circuit board and determine the issue. You will then be able to check for any corrosion or damage on the chip. It is recommended to use a clean, dry paper towel to keep the microchip from being damaged.

If you're unsure it is possible to check the battery connector's terminals for cracks, or breaks. If this is the case then resoldering the terminals to their original position will usually restore the functionality of the key fob. Additionally, you can look at the buttons to see if they are worn or damaged. If the buttons are loose, they can be soldered back in the event that the button has actually snapped off.

Interference Signals

Few things are more annoying than glancing at the "No Fob Detected" message when you attempt to start your vehicle. This usually occurs at the most inconvenient moments, such as when you're running late for work or picking up children from school/daycare. The good thing is that there are steps you can take to troubleshoot the issue and determine the root of the problem.

Interference signals can disrupt the remote key fob signal coming from the vehicle making it unable to function correctly. It can be caused by objects such as weather conditions, buildings and transmitters using the same frequency. Interference may occur if your vehicle has aftermarket equipment that transmits at the same frequency as your key fob.

In addition, if your key fob is exposed to salt or seawater, it may be damaged. Water can get into the rubber seals of the electronic chip, particularly when the key fob has been submerged in water for a long period of time. The chip can stop working and may require replacement of the keyfob. If you have a key that can be programmed and cleaned with isopropyl and electronic cleaners to bring it back to its original function. If this doesn't help you can be sure that the chip has been damaged and will need to be replaced.

Locking and Unlocking the Doors

The key fob's buttons send electronic signals to a solenoid in the car, which converts the signal into a mechanical action that locks and unlocks the doors. If your door lock does not work it could be because of an issue with the solenoid. This will require professionals from auto repair shops to investigate.

A dead 12 volt could cause the fob to stop working properly. This can happen when your battery loses its charge or if the contacts become corrosion-prone. This problem can be fixed in a matter of minutes by replacing the battery.

The receiver module may be the cause if the key fob does not function after replacing the battery or reprogram the device. The device interprets radio frequency signals received by the key fob to control the vehicle. If it breaks down it could be costly to repair.

To determine if this is correct, place your spare key into the key slot. Then, turn the ignition on. Press the key fob button three times in a matter of 10 seconds without removing it. The Mazda 3 system will now connect the key to the car and allow you to use it as your primary remote for driving. This allows you to program up three keys.