Lincoln MKZ Back Up Light Bulb Size

The Lincoln MKZ back up light requires a bulb size of 921 for proper installation and function within the rear lighting assembly. Available data for the specified component covers the range from 2007 to 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
2007-2012	921

Bulb Specifications

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

Other Locations

Additional Notes

The Lincoln MKZ uses the 921 bulb size for the back up light across the 2007-2012 model years.
The 921 is a wedge-type bulb, classified under the T15 designation, which refers to its tubular glass envelope size measured in eighths of an inch.
The 921 operates at 12 volts and 16 watts, which is consistent with standard automotive electrical systems.
The wedge base design means the 921 is held in its socket by the tension of the base itself, with no separate metal contact pins.
The 921 carries ANSI standardization recognized in both the United States and Canada, meaning it conforms to a defined set of electrical and physical tolerances.
The T15 wedge format is shared by several bulb numbers, though wattage ratings differ between them, making wattage a relevant factor when considering substitutions.