Saturn SL brake bulbs utilize 3157 and 2057 sizes, while the center high mount stop light requires PC168 or PC175 bulb sizes. The replacement chart covers 1991 through 2002 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Saturn SL brake light circuit uses two distinct bulb types across its production run: the 2057 for model years 1991-1999 and the 3157 for model years 2000-2002.
The 2057 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with a 26.9W high-filament and 8W low-filament draw, and is classified as a brighter variant of the 1157.
The 3157 is a dual-filament T25 wedge bulb rated at 12V with a 27W high-filament and 7W low-filament draw, and it uses a wedge base rather than a bayonet mount, making it physically incompatible with sockets designed for the 2057.
Both the 2057 and 3157 conform to ANSI standards recognized in the United States and Canada.
The base type difference between the 2057 (BAY15d bayonet) and the 3157 (wedge) means the two bulbs are not interchangeable, despite both serving the brake light function on the Saturn SL at different model years.
The Center High Mount Stop Light on the Saturn SL alternates between the PC168 and PC175 bulb types across model years, with no single type used exclusively throughout the listed range.
Both the PC168 and PC175 are miniature T10 wedge bulbs fitted with a printed circuit board twist-lock socket, rated at 12V, and conforming to ANSI standards for the United States and Canada.
The PC168 and PC175 share the same T10 wedge form factor and PCB socket interface, though they carry distinct ANSI designations, and substitution between the two warrants verification against the specific model year requirement.
The Center High Mount Stop Light specification covers model years 1995-2002, while the standard brake light specification extends back to 1991, reflecting a longer fitment history for the main brake circuit.