INFINITI QX50 Back Up Light Bulb Size

The INFINITI QX50 back up light uses a 921 bulb size for this model. The replacement chart covers vehicle production years spanning 2014 to 2017 with corresponding bulb specifications.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2014-2017	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The INFINITI QX50 uses the 921 bulb size for the back up light across the 2014-2017 model years.
The 921 bulb follows the ANSI standard, which is the recognized specification body for automotive lighting in the United States and Canada.
This bulb uses a wedge-style base, designated T15, which refers to the tubular glass envelope width measured in eighths of an inch, making it approximately 15/8 inches wide.
The 921 operates at 12 volts, consistent with the standard electrical system voltage found in conventional passenger vehicles.
The bulb carries a 16-watt power rating, which reflects the amount of electrical energy it consumes during operation.
The wedge base design means the bulb is held in place by tension from the socket contacts rather than a bayonet or screw mechanism, requiring no locking twist during installation.
The consistent use of the 921 across all four listed model years indicates full fitment interchangeability within the 2014-2017 QX50 back up light application.