Lexus NX300h back up light bulbs use a 921 size, with inner back up light bulbs also requiring the 921 size. The replacement chart covers vehicle production years spanning 2015 to 2018.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 921 bulb is the sole bulb size specified across all back up light positions on the Lexus NX300h for the 2015-2018 model years.
The 921 is an ANSI-standard bulb recognized in both the United States and Canada, operating at 12 volts and 16 watts.
The T15 wedge base of the 921 bulb means it is inserted directly into a socket without a separate metal base, relying on two wire leads molded into the glass envelope for contact.
The inner back up light on the 2018 Lexus NX300h carries a production cutoff notation of "To 09/2017," indicating that this fitment applies only to units manufactured up to that date within the 2018 model year production run.
Because the outer and inner back up light positions share the same 921 bulb size across the 2015-2018 model years, a single bulb type serves both locations, though the production date restriction on the 2018 inner position remains a relevant fitment consideration.