2021 Mazda CX-3 key fob battery
The 2021 Mazda CX-3 key fob takes a CR2032, a 20 × 3.2 mm 3 V lithium cell. Below: how to open it, what to do if it dies, and the manual we checked.
Buy CR2032 batteries CR2032 specs & equivalents
Our pick: Duracell CR2032, 2-pack on Amazon, a name-brand cell in child-resistant packaging.
Tip: change the spare key at the same time. Both cells usually age together.
Quick facts
Before you start
- Get a new CR2032 cell from a fresh pack.
- Work over a table or soft cloth so small parts and buttons don’t get lost.
- Note which way the old battery faces before you take it out.
- Keep loose coin cells away from children and pets. See coin battery safety.
How to replace the 2021 Mazda CX-3 key fob battery
- Slide the knob and remove the lower cover
- Press the tab to release the upper cover, then pry it off with a tape-wrapped flat screwdriver
- Lift off the cap and remove the old cell
- Fit the new CR2032 with the + side facing up and refit the cap
- Refit the upper cover, then hook the lower cover tabs into their slots and snap it on
2021 CX-3 owner's manual lists CR2032 (new key design; earlier years use CR2025).
After you change the battery
- Press lock and unlock from a few metres away. The car should react on the first press.
- On push-button start cars, start the engine once with the fob in your pocket.
- If nothing happens, re-open the fob and check the battery direction and contacts. More fixes: key fob not working after a battery change.
About the CR2032 battery
CR2032 is a 20 mm × 3.2 mm, 3 V lithium cell with a typical capacity of about 225 mAh. The same size is sold as DL2032, ECR2032, KCR2032, 5004LC. A CR2012 or CR2016 or CR2025 has the same diameter but is thinner, so it can fit loosely and runs down sooner. Stick with CR2032.
Photos from Mazda CX-3 owners
No owner photos yet for this generation.
Other vehicles that use a CR2032
2024–2025 Hyundai Elantra2021–2023 Hyundai Elantra2022–2023 Hyundai Kona2020–2022 Hyundai Palisade2021–2023 Hyundai Santa Fe2021–2023 Hyundai Sonata2022–2024 Hyundai Tucson2020–2023 Mazda CX-302021–2025 Mazda CX-52020 Mazda CX-52023–2024 Mazda CX-502021–2023 Mazda CX-9
Other Mazda CX-3 years
Questions
What battery does the 2021 Mazda CX-3 key fob use?
1 × CR2032 (smart key).
How many batteries does the 2021 Mazda CX-3 key fob need?
1 CR2032 cell.
Can I use a CR2012 or CR2016 or CR2025 instead of a CR2032?
It has the same 20 mm diameter but is thinner, so it can lose contact and runs down sooner. Use a CR2032.
Which battery names are the same as CR2032?
DL2032, ECR2032, KCR2032, 5004LC are the same size as CR2032.
Do I need to reprogram the key after changing the battery?
Most key fobs keep their pairing when the battery is changed. If the fob stops working, check the battery direction and contacts first; our troubleshooting guide covers the rest.
Related guides
Fob not working after a battery change?Signs the fob battery is dyingStarting a car with a dead fobCR2032 vs CR2025 vs CR2016