The Ford Crown Victoria brake light utilizes 4157, 2458, and 3157 bulb sizes depending on the specific version of the vehicle. The provided data covers a range from 1992 through 2011.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford Crown Victoria uses two different brake bulb sizes across its model years, with the 3157 fitted to 1992-2004 models and the 4157 fitted to 2005-2011 models.
Both the 3157 and 4157 are ANSI-standard dual-filament wedge bulbs of the T25 type, each rated at 12V with a 27W/7W filament configuration, where the higher wattage filament serves the brake function and the lower wattage filament serves a secondary lighting function such as a tail or parking light.
Although the 3157 and 4157 share the same T25 wedge base type and identical wattage ratings, they are not the same part number and are not confirmed as interchangeable within these specifications.
The center high mount stop light (CHMSL) on the Ford Crown Victoria uses the 912 bulb across all model years covered, from 1992 through 2011.
The 912 is an ANSI-standard single-filament wedge bulb of the T15 type, rated at 12V and 12W, and is classified as a variant of the 921 bulb.
Because the 912 is a variant of the 921, the two share a compatible base, though wattage output differs between them, with the 921 typically rated at a higher wattage than the 912.
The CHMSL circuit uses a single-filament bulb rather than a dual-filament type, which reflects its dedicated stop-light-only function with no secondary lighting role.
The T15 wedge base of the 912 is physically smaller than the T25 wedge base used by the 3157 and 4157, making the bulb types non-interchangeable between the CHMSL and the main brake light positions.