The Lincoln MKZ brake light requires a 3157NA bulb size for the specific lighting components located at the rear of the vehicle. Data for the specified lighting components covers the range from 2007 to 2009.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lincoln MKZ uses two distinct bulb types across its brake lighting system: the 3157NA for the standard brake lights and the 921 for the center high mount stop light.
The 3157NA is a dual-filament bulb, meaning it serves two independent lighting functions within a single housing, operating at 12V with a wattage split of 27W for the higher-intensity filament and 7W for the lower-intensity filament.
The 3157NA carries a natural amber glass envelope, which filters light output to a yellow-amber tone without requiring an amber-tinted lens on the vehicle itself.
The 3157NA is classified as a T25 wedge bulb under ANSI standards, recognized across both the United States and Canada.
The 921 is a single-filament T15 wedge bulb rated at 12V and 16W, designed for applications requiring one consistent level of light output.
The 921 also conforms to ANSI standards applicable in the United States and Canada, placing it within the same standardization framework as the 3157NA.
For the Lincoln MKZ (2007-2009), the 3157NA fitment applies to the standard brake light position, and substituting a non-amber or single-filament variant would not replicate the original specification.
The 921 fitment for the center high mount stop light spans 2007-2012 on the Lincoln MKZ, representing a consistent single-bulb specification across all six model years covered.
Because the 3157NA is a dual-filament type and the 921 is a single-filament type, the two bulbs are not interchangeable with each other despite both using wedge-style bases.