Lexus NX key fob battery
8 of the 12 model years listed for the Lexus NX 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.
- 2015-2020Smart key
CR2032
FCC ID HYQ14FBATwo sites agree: uhs-hardware.com and bestkeysupply.com (checked Nov 2, 2026)
Find CR2032 on Amazon - 2021Smart key
Not confirmed yet
- 2022-2023Smart key
Not confirmed yet
- 2024Smart key
CR2032
FCC ID HYQ14FLDTwo sites agree: bestkeysupply.com and uhs-hardware.com (checked Nov 2, 2026)
Find CR2032 on Amazon - 2025Smart key
CR2032
FCC ID HYQ14FLDTwo sites agree: bestkeysupply.com and uhs-hardware.com (checked Nov 2, 2026)
Find CR2032 on Amazon - 2026Smart key
Not confirmed yet
Changing the battery
Smart key (push-button start)
- Start by freeing the hidden metal key: there is a latch or slide on the case, and the blade comes out once it moves.
- Use the slot where the metal key sat. Twist, do not lever hard, and work along the seam until the halves separate.
- Note which side of the old coin cell faces up (usually the side with the writing), lift it out with a plastic tool, and press the new one in the same way.
- Snap the halves back together, slide the metal key home, and press each button, then try the start button from the driver's seat.
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.
Coin cells are a choking and burn hazard for children. Store the spares in their original pack, out of reach.