Lexus UX key fob battery
7 of the 8 model years listed for the Lexus UX 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.
- 2019Smart key
Not confirmed yet
- 2020-2022Smart key
CR2032
FCC ID HYQ14FBZTwo sites agree: uhs-hardware.com and bestkeysupply.com (checked Nov 2, 2026)
Find CR2032 on Amazon - 2023-2024Smart key
CR2032
FCC ID HYQ14FBZTwo sites agree: uhs-hardware.com and bestkeysupply.com (checked Nov 2, 2026)
Find CR2032 on Amazon - 2024Smart key (electronic key)
Not confirmed yet
- 2025-2026Smart key
CR2032
FCC ID HYQ14FLCOwner's manual: manua.ls (checked Nov 1, 2026)
Manual text: “Use a CR2032 lithium battery”
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.
- Use the slot where the metal key sat. Twist, do not lever hard, and work along the seam until the halves separate.
- Pop the old battery out with a toothpick or plastic pick, not a metal blade, and seat the new one with the + side matching the old one.
- Close the case until it clicks all the way round, put the metal key back, then try the buttons and a push-button start.
Lexus smart keys usually hide the metal key behind a release button; the cover opens from the notch next to where the key sat.
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.