Ford Flex Back Up Light Bulb Size

The Ford Flex back up light requires a 921 bulb size for proper installation and function within the rear lighting assembly. Data for the specified component covers the range from 2009 to 2019.

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
2009-2019	921

Bulb Specifications

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

Other Locations

Additional Notes

The Ford Flex uses the 921 bulb for the back up light across all model years from 2009 to 2019.
The 921 is a wedge-type bulb, classified under the T15 designation, which refers to its tubular shape measuring 15/8 inches in length.
Wedge bulbs are named for their wedge-shaped base, which holds the bulb in place without a separate metal socket or pins.
The 921 operates at 12 volts and draws 16 watts, which is consistent with standard automotive reverse light applications.
The 921 conforms to ANSI standards recognized in both the United States and Canada, indicating a standardized specification for the bulb's electrical and physical characteristics.
The T15 wedge form factor is a common fitment in reverse light applications across many vehicle platforms, though substitutions should be verified against the original wattage and base type before use.
Using a replacement bulb with a higher wattage than the specified 16W risks overloading the socket and wiring harness designed for the original specification.