Lincoln MKS Back Up Light Bulb Size

The Lincoln MKS back up light requires a 921 bulb size for proper installation and function. Data for the specified component covers the range from 2009 through 2012.

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
2009-2012	921

Bulb Specifications

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

Other Locations

Additional Notes

The Lincoln MKS uses the 921 bulb for the back up light across the 2009-2012 model years.
The 921 is a wedge-style bulb, meaning it seats directly into a socket without a separate base or pins, relying on the tension of its glass envelope to maintain contact.
The T15 designation refers to the bulb's tubular shape, with the numeric portion indicating a width of 15 eighths of an inch.
The 921 operates at 12 volts and 16 watts, which is consistent with standard automotive electrical systems.
The 921 carries ANSI standardization, meaning its physical and electrical specifications are governed by a recognized industry standard applicable in both the United States and Canada.
Because the 921 is an ANSI-standardized wedge bulb, other bulbs sharing the same T15 wedge base and 12V/16W rating are generally considered interchangeable, provided the replacement meets the original electrical specifications.