Ford Crown Victoria front and rear turn signal bulbs utilize 3457NA, 3357NA, 3157NA, and 4157 sizes depending on location and model generation. The replacement chart covers 1992 through 2011 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford Crown Victoria front turn signal uses three distinct bulb types across its 1992-2011 model range: the 3157NA for 1992-1996, the 3457NA for most other years, and the 3357NA for 2006 and 2010.
The 3457NA is a dual-filament T25 wedge bulb rated at 12V with a 27W high filament and 7W low filament, featuring natural amber glass. It serves as the front turn signal bulb for the Crown Victoria across the majority of model years in the specification, including 1997-2005, 2007-2009, and 2011.
The 3357NA differs from the 3457NA in that it is a single-filament bulb, also rated at 12V and 27W, in the same T25 natural amber form. Despite sharing the T25 wedge base and amber glass with the 3457NA, the absence of a second filament makes these two bulbs non-interchangeable in applications that require dual-filament operation.
The 3157NA is a dual-filament T25 wedge bulb with natural amber glass, rated at 12V, 27W/7W, and is electrically equivalent in output to the 3457NA. It serves as the front turn signal bulb for the Crown Victoria for model years 1992-1996.
The rear turn signal on the Ford Crown Victoria uses only two bulb types across its full model range: the 3157 for 1992-2004 and the 4157 for 2005-2011.
The 4157 is a dual-filament T25 wedge bulb rated at 12V, 27W/7W, and shares its wattage and base type with the 3157. However, the two are separate ANSI designations and are not confirmed interchangeable by the specifications.
All bulb types listed across both front and rear turn signal positions share the T25 wedge base form and operate on a 12V electrical system, reflecting a consistent base platform across the Crown Victoria's turn signal lighting throughout its production span.
The "NA" suffix in bulb designations such as 3457NA, 3357NA, and 3157NA denotes natural amber glass, meaning the amber color is produced by the glass envelope itself rather than by a coating or the lens housing.
The rear turn signal bulbs in this specification, the 3157 and 4157, carry no "NA" suffix, indicating they use clear glass rather than natural amber envelopes.
All five bulb types in the specification conform to ANSI standards applicable to the US and Canadian markets.