Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 Mazda 2 L4-1.5LFACTORY OEM SERVICE PROCEDURE
Keyless Entry Transmitter Battery: Service and Repair
TRANSMITTER BATTERY REPLACEMENT [KEYLESS ENTRY SYSTEM]
1. Insert a flathead screwdriver into the transmitter notch and remove the key from the transmitter by pressing the tab.
2. Insert a flathead screwdriver into the transmitter notch and open the transmitter.
3. Remove the battery by pressing it in the direction of the arrow shown in the figure.
4. Install the new battery (CR1620) with the plus pole facing down.
5. Align the upper and lower covers and close the transmitter.
Battery type
- Lithium battery CR1620
Battery life
- Approx. 2 years (when used approx. 10 times/day)
6. Install the key to the transmitter.
NOTE:
- When connecting the key to the transmitter, grip the key and the transmitter as shown in the figure and connect until a click sound is heard.
- If the key is not completely connected to the transmitter, they may come apart.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.