BMW X3 key fob battery
2 of the 22 model years listed for the BMW X3 have a proven battery. The most common answer is CR2032. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.
- 2004-2006Key-head remote
Not confirmed yet
- 2007Key-head remote
Not confirmed yet
- 2008-2010Key-head remote
Not confirmed yet
- 2011-2017Smart key
Not confirmed yet
- 2014-2017Smart key
Not confirmed yet
- 2018-2021Smart key
Not confirmed yet
- 2022Smart key
CR2032
Owner's manual: manua.ls (checked Nov 1, 2026)
Manual text: “Insert a type CR 2032 3V battery with the positive side facing up.”
Find CR2032 on Amazon - 2023-2024Smart key
Not confirmed yet
- 2025Smart key
CR2032
Owner's manual: manua.ls (checked Nov 1, 2026)
Manual text: “Insert a CR2032 3V battery with the positive terminal facing down.”
Find CR2032 on Amazon
Changing the battery
Smart key (push-button start)
- Most push-button fobs hide a metal backup key. Press or slide its catch and draw the key out first.
- Look inside the empty key slot for a notch. Put the tip of the metal key or a small flat screwdriver wrapped in tape there and twist gently until the shell splits.
- Before you take the old cell out, look at its face. Put the new cell in with the same side showing, and avoid touching both faces at once.
- Reassemble, refit the emergency key, and check that the car sees the fob when you press start.
A CR2032 is 20 mm across and 3.2 mm thick. CR2032, CR2025 and CR2016 share the same width but not the same thickness, so a swap between them can leave a loose contact or a case that will not close.
If a child might have swallowed a coin cell, treat it as an emergency and get to a hospital right away.