Where Will Mazda 6 Key Fob Be One Year From Today? Changing the Battery in Your Mazda 3 Key Fob

It is frustrating to pull into your car at the conclusion of a long and tiring day and find that the key fob is dead. This is a simple fix that can be done at a big box retailer or at a hardware store.

Adding a spare key fob to your Mazda 3 can be an inexpensive way to save yourself from the hassle of being driven to the dealership and having them re-program your keys.

Battery Replacement

The battery replacement in the Mazda 3 key fob is a simple process that you can perform at home. You should only replace it when the battery goes out or if you see a message reading "Low keyfob battery" on the multi-information display. Replace battery."

To open the key fob case You'll need a tape wrapped flathead screwdriver and a bit of patience. Locate lost mazda 3 key or gap in the bottom part of the metal of the Mazda 3's key fob, and then insert the head of the screwdriver into it to remove the lower half. Repeat the procedure for the top metal piece however, be careful not to scratch the rubber ring on the bottom of the case.

Once the fob case has been open, you'll be able to see the slots on either side of the case that houses the battery. Start on the other side of the case and gently push it open. Take out the old CR2025 and replace it with a new one, making sure to place it face-up to ensure the correct direction of polarity. Finally, place the battery cap back on and reattach both sides to the key fob's case, pressing until you hear them click.

After replacing the battery Test the fob to confirm it's working by locking and unlocking your doors. If everything looks good then you're able to use your Mazda 3's remote features for the first time!

Pairing Issues

This could mean that the transmitter in your car is damaged. This typically requires a professional to repair and will likely require a new key fob.

If you've tried to replace the battery and reprogramme the key fob but it's not working then the chip in the key fob could be faulty. This can happen when the key fob has been dropped on hard surfaces, exposed to salt water, or even touched by dirty hands.


You'll need the tiny "key", which is inserted into the seam to remove the circuit board and determine the problem. Then, you will be able to look for any damage or corrosion on the electronic chip. To prevent damaging the chip, it's recommended to use a clean paper towel.

It 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 connecting them back can usually restore the function of the key fob. It is also possible to check the buttons for wear or damage. If the buttons are loosened, they can be resoldered into place unless one has physically snapped.

Interference Signals

Few things are more frustrating than staring at a "No Fob Detected" message when you attempt to start your car. It typically happens at most unpopular time, such as when you're late for work or when you are picking up your children from daycare/school. There are several things you can do to find out what's causing the issue.

Interference signals can interfere with the remote key fob's signal to the vehicle, causing it to not function properly. This can be caused by objects such as weather conditions, buildings as well as transmitters operating 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. The rubber seals on the electronic chip can be shattered by water, especially in the event that it is submerged for long periods of time, like in a swimming pool or at the beach. This could cause the chip to cease working and require replacement of the key fob. If you have a key that has the ability to be programmed to work, you can clean it using isopropyl or electronic cleaners to bring it back to its original function. If this doesn't work you can be sure that the chip is fried and must be replaced.

Locking or Unlocking the Doors

The buttons on the keys send electronic signals to the solenoid inside the car. It then converts the signal into a mechanical action that locks and unlocks doors. If the door lock isn't working it could be because of an issue with the solenoid. This will require professional repair shops to analyze.

A dead 12V battery can also stop the fob from functioning effectively. This can happen when your battery is not charged or if the contacts are corroded. The good news is that a new battery is able to fix this issue in just minutes.

If the key fob isn't functioning after you change the battery or try to re-program it, the issue might be related to the receiver module. The device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. If it fails, it can be expensive to repair.

To check whether this is the case, start by inserting your spare keys into the key slot and setting the ignition to ON. Press the key fob button three times in a matter of 10 seconds without removing it. The Mazda 3 system will now be able to synchronize the key with your car and allow you to use it as your primary remote for driving. You can program up to three keys this manner.