When your Mazda CX-9 starts showing a Key Battery Low message, or your remote only works up close, it is time for a Mazda CX-9 key fob battery replacement.
This guide covers all model years from launch to today, with exact battery types, generations, and step by step replacement instructions.
- Mazda CX-9 Key Fob Battery Type by Year
- How to Replace Mazda CX-9 Key Fob Battery
- 1. Remove the emergency key
- 2. Open the key fob housing
- 3. Take out the old battery
- 4. Insert the new battery
- 5. Reassemble the fob
- Mazda CX-9 Key Battery Replacement Cost
- Common issues after Mazda CX-9 key fob battery replacement
- FAQ
- Author
Mazda CX-9 Key Fob Battery Type by Year
Mazda CX-9 поколений меньше, но ключи отличаются дизайном:
- 2007–2015 – older smart key, CR2025
- 2016–2025 – newer proximity smart key, CR2032
Ниже таблица по годам с одинаковыми Notes внутри поколений.
| Model Year | Generation | Key Style | Battery Type | Notes |
|---|---|---|---|---|
| Mazda CX-9 2007 | Gen 1 | Smart key | CR2025 | First generation CX-9 smart key featuring a mechanical key release and a basic, easy to service internal battery holder |
| Mazda CX-9 2008 | Gen 1 | Smart key | CR2025 | First generation CX-9 smart key featuring a mechanical key release and a basic, easy to service internal battery holder |
| Mazda CX-9 2009 | Gen 1 | Smart key | CR2025 | First generation CX-9 smart key featuring a mechanical key release and a basic, easy to service internal battery holder |
| Mazda CX-9 2010 | Gen 1 | Smart key | CR2025 | First generation CX-9 smart key featuring a mechanical key release and a basic, easy to service internal battery holder |
| Mazda CX-9 2011 | Gen 1 | Smart key | CR2025 | First generation CX-9 smart key featuring a mechanical key release and a basic, easy to service internal battery holder |
| Mazda CX-9 2012 | Gen 1 | Smart key | CR2025 | First generation CX-9 smart key featuring a mechanical key release and a basic, easy to service internal battery holder |
| Mazda CX-9 2013 | Gen 1 | Smart key | CR2025 | First generation CX-9 smart key featuring a mechanical key release and a basic, easy to service internal battery holder |
| Mazda CX-9 2014 | Gen 1 | Smart key | CR2025 | First generation CX-9 smart key featuring a mechanical key release and a basic, easy to service internal battery holder |
| Mazda CX-9 2015 | Gen 1 | Smart key | CR2025 | First generation CX-9 smart key featuring a mechanical key release and a basic, easy to service internal battery holder |
| Mazda CX-9 2016 | Gen 2 | Proximity key | CR2032 | Second generation proximity fob designed for stronger signal stability and a simplified battery tray for quick DIY servicing |
| Mazda CX-9 2017 | Gen 2 | Proximity key | CR2032 | Second generation proximity fob designed for stronger signal stability and a simplified battery tray for quick DIY servicing |
| Mazda CX-9 2018 | Gen 2 | Proximity key | CR2032 | Second generation proximity fob designed for stronger signal stability and a simplified battery tray for quick DIY servicing |
| Mazda CX-9 2019 | Gen 2 | Proximity key | CR2032 | Second generation proximity fob designed for stronger signal stability and a simplified battery tray for quick DIY servicing |
| Mazda CX-9 2020 | Gen 2 | Proximity key | CR2032 | Second generation proximity fob designed for stronger signal stability and a simplified battery tray for quick DIY servicing |
| Mazda CX-9 2021 | Gen 2 | Proximity key | CR2032 | Second generation proximity fob designed for stronger signal stability and a simplified battery tray for quick DIY servicing |
| Mazda CX-9 2022 | Gen 2 | Proximity key | CR2032 | Second generation proximity fob designed for stronger signal stability and a simplified battery tray for quick DIY servicing |
| Mazda CX-9 2023 | Gen 2 | Proximity key | CR2032 | Second generation proximity fob designed for stronger signal stability and a simplified battery tray for quick DIY servicing |
| Mazda CX-9 2024 | Gen 2 | Proximity key | CR2032 | Second generation proximity fob designed for stronger signal stability and a simplified battery tray for quick DIY servicing |
| Mazda CX-9 2025 | Gen 2 | Proximity key | CR2032 | Second generation proximity fob designed for stronger signal stability and a simplified battery tray for quick DIY servicing |
How to Replace Mazda CX-9 Key Fob Battery
These steps apply to all generations, both smart and proximity keys.
1. Remove the emergency key
Slide the release button and pull out the mechanical key.
2. Open the key fob housing
Insert the metal key or a small plastic tool into the side slot and gently twist to separate the case.
3. Take out the old battery
Lift the coin cell from its tray.
Check the type: CR2025 (older CX-9) or CR2032 (2016+).
4. Insert the new battery
Positive side should face upward.
5. Reassemble the fob
Snap the case back into place and reinsert the key.
The remote should begin working immediately.
Mazda CX-9 Key Battery Replacement Cost
- DIY battery only: $3–$8
- Locksmith service: $10–$25
- Dealer service: $25–$50
DIY is always the most cost effective option.
Common issues after Mazda CX-9 key fob battery replacement
- Key still shows Low Battery
- Remote range is weak
- Push button start does not recognize the fob
- Buttons work, but unlocking is inconsistent
Most issues come from:
- Low quality batteries
- Improper seating of the coin cell
- Dust or bent contacts inside the tray
FAQ
First generation Mazda CX-9 key fobs (2007–2015) use a CR2025 coin cell, while second generation proximity fobs (2016–2025) use a CR2032 battery.
Yes. The CX-9 key fob is designed for simple DIY service. You only need a new coin cell battery and the built in mechanical key to open the case.
This warning appears when the battery voltage drops below a stable operating level. Remote range also becomes weaker.
No. Mazda key fobs store pairing data permanently. Replacing the battery does not reset or erase the programming.
A new CR2025 or CR2032 costs 3–8 dollars. Locksmith and dealer services range from 20–50 dollars.
Check that the battery is seated correctly, reinstall it facing the right direction, and try locking or unlocking the car several times. If the push start does not recognize the key, hold the fob directly against the start button.
