Toyota 4Runner key fob battery
7 of the 31 model years listed for the Toyota 4Runner have a proven battery. The most common answer is CR2016. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.
- 1996Unknown
Not confirmed yet
- 1997Mechanical key only (no factory wireless remote in manual)
Not confirmed yet
- 1998Remote (separate, dealer-installed VIP RS3000 accessory)
Not confirmed yet
- 1999-2002Remote (separate)
Not confirmed yet
- 2000-2002Remote (separate)
Not confirmed yet
- 2003Remote (separate wireless remote control transmitter)
Not confirmed yet
- 2004-2009Remote (separate)
Not confirmed yet
- 2010-2012Key-head remote
Not confirmed yet
- 2010-2012Smart key
Not confirmed yet
- 2013Key-head remote
CR2016
FCC ID HYQ12BBYTwo sites agree: uhs-hardware.com and bestkeysupply.com (checked Nov 2, 2026)
Find CR2016 on Amazon - 2013Smart key
Not confirmed yet
- 2014-2015Key-head remote
Not confirmed yet
- 2014-2015Smart key
Not confirmed yet
- 2016-2019Key-head remote (wireless remote key)
CR2016
Two sites agree: bestkeysupply.com and energizer.com (checked Nov 2, 2026)
Find CR2016 on Amazon - 2016-2019Smart key
CR1632
Two sites agree: uhs-hardware.com and energizer.com (checked Nov 2, 2026)
Find CR1632 on Amazon - 2020Key-head remote
Not confirmed yet
- 2020Smart key
Not confirmed yet
- 2021Key-head remote (wireless remote key)
Not confirmed yet
- 2021Smart key
Not confirmed yet
- 2022Key-head remote
Not confirmed yet
- 2022Smart key
Not confirmed yet
- 2023Smart key (electronic key)
Not confirmed yet
- 2024Unknown
Not confirmed yet
- 2025-2026Smart key (electronic key)
CR2450
FCC ID HYQ14FBWOwner's manual: manua.ls and amanuals.com (checked Nov 1, 2026)
Manual text: “Items to prepare: Lithium battery CR2450”
Find CR2450 on Amazon
Changing the battery
Key with remote in the head
- Here the key blade and remote are one piece. You open the plastic head, not the blade.
- Find the seam around the head. Twist a coin or small flat screwdriver in the notch at the blade end or side until the halves part.
- Replace the cell with the same face showing, and make sure the rubber keypad sits flat before closing.
- Press the head together until it clicks and test the buttons. The transponder chip that lets the car start is separate from the battery, so starting should not change.
A CR2016 is 20 mm across and 1.6 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.
Smart key (push-button start)
- Find the small release on the edge or back of the fob and hold it while you pull out the metal emergency key.
- The gap left by the metal key usually has a pry point. A slow twist with a thin flat tool (tape on the tip saves the plastic) opens the two halves.
- 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.
- Close the case until it clicks all the way round, put the metal key back, then try the buttons and a push-button start.
On most Toyota smart keys the metal key slides out after you press a small release, and the case opens at the slot it leaves behind.
A CR1632 is 16 mm across and 3.2 mm thick. It is easy to confuse with the 20 mm CR20xx sizes, which will not fit.
A CR2450 is 24.5 mm across and 5.0 mm thick, much fatter than a CR2032. A thinner cell will rattle and lose contact, so buy the exact size.
Keep spare coin cells away from small children. A swallowed coin cell can burn the throat within hours; if it happens, go to an emergency room at once.