John Kennedy Mazda Pottstown

Mar 17, 2025
Red Mazda CX-90

The humble key fob, which primarily allowed Mazda owners to lock and unlock their vehicle from a distance, has evolved into a smart device with advanced remote capabilities. Because many drivers now rely on their key fob for many vehicular functions, a dead key fob battery can be frustrating. Thankfully, it’s easy to replace a Mazda key fob battery. Read on to know the types of Mazda key fobs, get helpful tips on replacing a Mazda key fob, and learn how to extend the device’s battery life.

Understanding Your Mazda Key Fob

A key fob is a device that uses radio frequencies to communicate with a vehicle. It allows you to lock and unlock your car’s doors, including the tailgate, from a distance. Over the years, Mazda key fobs have added several other functions, including remote start, which allows you to start your car without being physically present. 

One thing that hasn’t changed is the battery, which powers the small device. If your key fob battery dies, it will become unresponsive, and you might need to use a physical key to lock and unlock your vehicle’s doors. This makes it essential to know how to replace a key fob battery to avoid getting stranded when you least expect.

Types of Mazda Key Fobs and Their Features

The following are the types of Mazda key fobs and their features:

  • Traditional Key Fob: The traditional key fob is typically a metallic or plastic device with a simple remote locking and unlocking function. Most of these key fobs also have a flip key you can use if the device fails, which can happen when the battery dies.
  • Smart Key Fob: The smart key fob adds features such as push-button start and keyless entry. With this device, it became possible to start your Mazda remotely, allowing you to pre-condition the cabin before getting to the car.
  • Mazda Advanced Keyless Entry: This device builds upon the smart key fob with advanced features such as automatic door locking, encrypted signals, memory settings, and other safety and convenience functions. 

Essential Tools for Replacing a Mazda Key Fob Battery

If your key fob battery dies, you’ll need a few tools to replace it. These include:

  • A small flathead screwdriver or a plastic pry tool to open the key fob casing without damaging it. 
  • A replacement battery, which is often a CR2032 coin cell. Check your owner’s manual if you’re not sure.
  • You’ll also need a clean work surface, so you don’t lose any items from the opened key fob.

How To Replace Your Mazda Key Fob Battery

Below, we’ve outlined how to replace the battery in your Mazda key fob.

How To Safely Open Your Mazda Key Fob

Turn the key fob over and locate the seam where the two halves of the casing meet. Use a plastic pry tool or a small flathead screwdriver to separate the casing at the seam. Take care not to damage any internal components. 

Removing the Old Battery

After opening the key fob, locate the battery in its compartment. Note its orientation so you know how to install the new one correctly. Using your fingers or a small tool, gently lift the old battery out of its slot. Dispose of the old battery properly, following local guidelines. 

Inserting the New Battery Correctly

Take your replacement battery and verify it’s the correct type for your Mazda key fob. Check the battery markings against the specifications in your owner’s manual. Insert the new battery into the compartment, and ensure that the positive and negative sides touch the contacts properly. 

Closing and Testing the Key Fob

After inserting the new battery, snap the two halves of the key fob back together. Make sure all clips are securely fastened and that the casing aligns properly at the seams. Once reassembled, press the buttons to see if the vehicle responds. If the vehicle doesn’t respond, you may have to open it and check whether you got the battery polarity right. If the battery is the right one and you placed it correctly, then it’s advisable to get a professional opinion on what’s really wrong with the key fob.

Extending the Life of Your Mazda Key Fob

To prevent future battery issues, these tips can help extend the life of your Mazda key fob battery: 

  • Store your key fob away from extreme heat or cold to prevent premature battery failure. 
  • Avoid exposing the key fob to moisture, as this can corrode the battery contacts and prevent them from working properly
  • Clean your key fob regularly with a dry, soft cloth. 
  • If you notice a decrease in performance, check the battery contacts for corrosion and clean them with a small amount of rubbing alcohol. 

If you have any issues while changing your Mazda key fob battery or the device doesn’t work properly after replacing the battery, consult a professional. Certified technicians at a reputable dealership, such as John Kennedy Mazda of Pottstown, or a locksmith, can diagnose and resolve any issues you have with your key fob.

Get Expert Key Fob Maintenance at John Kennedy Mazda of Pottstown in Pottstown, Pennsylvania

In case your key fob still doesn’t work after replacing the old battery, it’s important to seek professional help to keep your car secure. At John Kennedy Mazda of Pottstown, we’re here to help resolve any issues you may have with your vehicle’s key fob. Schedule a service at our dealership if your key fob is acting up or you need professional automotive locksmithing services. Contact us today and enjoy a hassle-free driving experience with a reliable key fob that meets your everyday needs.

Image from mazdausa.com