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Changing the Battery in Your Mazda 3 Key Fob

It's a pain to pull into your car at the end of a long, hard day and discover that your key fob is dead. This is a straightforward fix that can be found at a major box retailer or at a hardware store.

A spare key fob for your Mazda 3 is an inexpensive option to not have to be towed to a dealership in order to have them re-program your keys.

Battery Replacement

Changing the battery in the Mazda 3 key fob is an easy procedure that you can perform at home. But, you should only replace the battery if it fails, or when the key fob displays a message on the multi-information display saying, "Low key fob battery. Replace battery."

You'll need to use an flathead screwdriver along with tape and patience to open the case. Place the head of the flathead screwdriver into a notch, or gap, on the bottom metal of the Mazda 3 key fob to cut off the lower half. 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's case is open, you'll be able to see a slot on either side of the case, which houses the battery. Use the flathead screwdriver with tape to gently open the case, starting on one side and then moving to the other. Remove the old battery, and put in the new CR2025 and make sure it's face-up for the correct orientation. Install the cap on the battery again 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 test that the fob works. If everything appears to be working then you can begin using the Mazda 3's remote features in the road!

Pairing Issues

If your key fob stopped suddenly it could be because the transmitter inside the car has been damaged. It is typically a need for a professional to repair and will likely require a new key fob.

If you have tried replacing the battery and reprogramming the key fob, but this does not solve the issue, it is possible that the chip inside the key fob is malfunctioning. This could happen if the keyfob has been dropped, exposed to saltwater, or handled by dirty fingers.

To identify the issue, you will need to locate a tiny "key" built into the fob's seam which allows you to take it apart and remove the circuit board. Then, you will be able check for any damage or corrosion on the electronic chip. To prevent damaging the microchip, it is best to use a fresh paper towel.

mazda 2 car key battery is also possible to take a close look at the battery connector terminals to see if they are damaged or cracked. If this is the case, carefully soldering them back in place will usually restore the function of the key fob. Similarly, you can inspect the buttons to determine if they are worn or damaged. If the buttons are loosened, they can be soldered back to their original position unless they have physically snapped.

Interference Signals

There's nothing more difficult than trying to start your car and then seeing the message "No Fob Detected". It usually happens at the most awkward moments, like the time you're late to work or when you are picking up your children from daycare or school. There are some things you could do to troubleshoot and find out the root of the issue.


Interference signals can cause the remote key fob to stop working properly. This can be caused by objects like buildings, weather conditions and transmitters that operate on the same frequency. Interference can also occur if you have equipment from an aftermarket manufacturer installed in the vehicle that transmits on the same frequency as the key fob.

Additionally, if the key fob is exposed to salt or water water it may be damaged. Water can damage the rubber seals of the electronic chip, especially when the key fob has been submerged in water for a prolonged period of time. This could cause the chip to stop functioning and may require replacement of the key fob. If you have a key that can be programmed to work, you can clean it using isopropyl or electronic cleaners to bring it back to its original functionality. If this does not work the chip, it's likely to be damaged and needs to be replaced.

Locking or Unlocking the Doors

The buttons on the key fob send electronic signals to the solenoid in the car, which converts the signal into mechanical action. It locks and unlocks doors. If the door lock isn't working it could be because of an issue with the solenoid. This requires experts from auto repair shops to examine.

A dead 12 volt battery could cause the fob to stop functioning properly. This happens when the battery loses charge or the contacts become corroded, and stop transferring electricity. The problem can be addressed in minutes with a new battery.

If the key fob doesn't work after you have changed the battery or program it again the problem could be with the receiver module. This device receives radio frequency signals from the key fob and interprets them to control the vehicle's functions. It could be a costly repair if the device becomes defective.

To test if this is true, place your spare key in the key slot. Then, turn the ignition on. Press the key fob two times in a period of 10 seconds, without taking it out. The Mazda 3 system will now connect the key to the vehicle and you can then use it as your primary remote for driving. This lets you program up three keys.

Read More: https://www.thekeylab.co.uk/mazda-car-keys/