How to Change Mazda Key Fob Battery
For many Mazda owners, the key fob is a convenient piece of technology that allows for keyless entry and ignition start. However, like all battery-operated devices, the key fob's battery will eventually wear out.
Knowing how to identify the signs of a weakening battery and how to replace it can save you from unexpected inconveniences.
Published: March 6, 2024.
First Signs of Weak Mazda Key Fob Battery
Being able to recognize the early signs of a weakening key fob battery can prevent situations where your key fob suddenly stops working. Here are some common indicators:
- Reduced Range: If you find yourself needing to get closer to your Mazda than before to unlock it or start the engine, this is often the first sign of battery drain.
- Inconsistent Operation: When button presses sometimes work and sometimes don't, it's a clear indication that your battery is starting to fail.
- Warning Light: Some Mazda models have a dashboard warning light that alerts you when your key fob battery is low.
- Total Failure: If your key fob stops working entirely, check the battery first before assuming there's a more serious issue.
Most Common Key Fob Batteries
Before you proceed with replacing your Mazda key fob battery, you need to know the right type of battery required. The most common types used in Mazda key fobs are the CR2025 and CR2032 3-volt coin batteries. These batteries are easily available at electronics stores, supermarkets, or online.
Check your Mazda’s owner manual to confirm the specific battery type your key fob uses.
How to Replace Your Mazda Key Fob Battery
Replacing the battery in your Mazda key fob is a straightforward process that requires minimal tools. Follow these steps to ensure a smooth replacement:
Step 1: Gather Your Materials
You will need a flat-head screwdriver, a new CR2025 or CR2032 battery (depending on your model), and your Mazda key fob.
Step 2: Open the Key Fob
Locate the notch or opening along the seam of your key fob. Insert the flat-head screwdriver into the notch and gently twist to pry open the key fob. Some models might have a slide or a button that releases the back cover.
Step 3: Remove the Old Battery
Once open, identify the battery. Use the screwdriver to pry out the old battery carefully. Be sure not to touch the new battery with your fingers as oils and dirt can affect performance.
Step 4: Insert the New Battery
Take your new battery, ensuring that the positive (+) side is facing the correct direction as indicated in the key fob’s battery compartment. Gently press the new battery into place.
Step 5: Reassemble the Key Fob
Snap the two halves of your key fob back together. Make sure the edges are sealed tightly to avoid any damage or moisture entering the key fob.
Step 6: Test the Key Fob
Once reassembled, test the key fob to ensure it's working correctly by locking and unlocking your Mazda. If it doesn't work, double-check that the battery is properly seated and that the battery contacts are clean.
Popular Hyundai Models and Their Key Fob Batteries
Creating a comprehensive list of popular Mazda models along with the specific key fob batteries they utilize involves a broad array of vehicles, given Mazda's extensive lineup over the years.
This list aims to cover a range of models from various years, providing a quick reference for the type of battery you might need if you own one of these vehicles.
Note that within model ranges, the exact key fob design and, therefore, the battery type might vary, especially across different generations or facelifts. Always refer to your vehicle owner's manual or remove the existing battery to verify the correct type before purchasing a replacement.
Mazda2
- 2010-2014 Models: CR1620
- 2015-Present Models: CR2025
Mazda3
- 2004-2009 Models: CR2025
- 2010-2013 Models: CR2025
- 2014-Present Models: CR2032
Mazda6
- 2003-2008 Models: CR2025
- 2009-2012 Models: CR2025
- 2013-Present Models: CR2025 or CR2032 (depending on key fob type)
Mazda CX-3
- 2016-Present Models: CR2025
Mazda CX-5
- 2012-2016 Models: CR2025
- 2017-Present Models: CR2032
Mazda CX-7
- 2007-2012 Models: CR2025
Mazda CX-9
- 2007-2015 Models: CR2025
- 2016-Present Models: CR2032
Mazda MX-5 Miata
- 2006-2015 Models: CR1620
- 2016-Present Models: CR2032
Mazda RX-8
- 2004-2012 Models: CR2025
Mazda5
- 2006-2015 Models: CR2025
This list serves as a general guide for the most commonly owned Mazda models and their respective key fob batteries.
However, it's crucial to remember that manufacturers may change key fob designs and battery requirements without notice. Therefore, variations can exist even within the same model based on the trim, country, and specific year.
For the most accurate information, consulting the vehicle owner's manual or inspecting the existing key fob battery is always recommended. If in doubt, professional advice from a Mazda dealer or a qualified locksmith can ensure you get the correct battery for your key fob.
Do You Have To Reprogram the Mazda Key Fob After the Battery Replacement?
No, typically, you do not have to reprogram a Mazda key fob after replacing its battery. The key fob's programming should remain intact after a battery change because the programming is stored in the key fob's internal memory, which is not wiped out by losing power.
Once the new battery is installed, the key fob should continue to work with your vehicle as it did before the battery was replaced.
However, if you find that your key fob is not working after the battery replacement, there could be a few reasons for this:
- Battery Orientation: Ensure that the new battery is installed correctly, with the positive (+) side facing the right direction.
- Battery Type: Verify that the correct type of battery is used (e.g., CR2025 or CR2032), as indicated by your Mazda’s owner manual.
- Damaged Contacts: Check for any damage or corrosion on the battery contacts within the key fob. Clean the contacts if necessary.
- Key Fob Damage: The key fob itself might have been damaged, especially if it was dropped or exposed to liquids.
If, after checking these factors, your key fob still does not work, consult your Mazda dealer or a professional locksmith for assistance. In some rare cases, a reprogramming might be necessary, but this is not typically required just for a battery change.
How to Start Mazda With Dead Key Fob Battery?
Starting a Mazda with a dead key fob battery is a common concern among owners. Fortunately, Mazda vehicles are equipped with a backup method to start the car even when the key fob battery is dead.
Here’s a general guide on how to do it, though specifics can vary depending on the model and year of your Mazda. Always refer to your owner's manual for model-specific instructions.
For Mazda Models with a Start/Stop Button
- Remove the Key Fob Cover: Many Mazda models have a key fob with a removable mechanical key. You can use this key to unlock the doors if they are locked.
- Find the Start/Stop Button: Locate the Start/Stop engine button inside the vehicle.
- Hold the Key Fob to the Button: With the key fob battery dead, the car won't detect the fob in the usual way. Hold the back part of the key fob (where the battery is located) against the Start/Stop button. Mazda has designed the system to recognize the fob even without a functioning battery when it's held very close to the button.
- Press the Brake Pedal (or Clutch if Manual): While holding the key fob against the Start/Stop button, press the brake pedal (or the clutch pedal if your Mazda is a manual). This action signals the car that you intend to start the engine.
- Press the Start/Stop Button: While continuing to hold the key fob against it, press the Start/Stop button to start the engine.
For Mazda Models with a Key Ignition
If your Mazda uses a traditional key ignition and your key fob battery is dead, you can still unlock the doors using the mechanical key hidden inside the fob.
Insert the key into the ignition in the traditional manner and start the car as you normally would.
Additional Tips
- After starting your Mazda with a dead key fob battery, consider replacing the battery as soon as possible to restore full remote functionality and convenience.
- Some Mazda models may have a specific key fob slot or backup location where you need to insert or hold the key fob. Consult your vehicle's manual for exact details.
- Keeping a spare key fob battery in your glove box or at home can prevent being inconvenienced by a dead battery.
Mazda's design ensures that a dead key fob battery doesn't leave you stranded. By following these steps, you can start your Mazda and proceed to your destination.
While this method works well as a temporary solution, replacing the key fob battery promptly will ensure that all the convenient features of your Mazda remain at your fingertips.