The Saturn SL1 brake component utilizes unique bulb sizes 3157, 2458, and 2057 depending on the specific version of the vehicle. Data for the lighting specifications covers the range from 1991 to 2002.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Saturn SL1 brake light circuit relies on two bulb types across its production span: 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 power draw of 26.9W on the high-filament circuit and 8W on the low-filament circuit.
The 3157 is a dual-filament T25 wedge bulb rated at 12V, drawing 27W on the high-filament circuit and 7W on the low-filament circuit, and it follows the ANSI standard for the US and Canada.
Although the 2057 and 3157 share a dual-filament design and similar wattage ratings, they use different base types, making them physically non-interchangeable without an adapter.
The center high mount stop light on the Saturn SL1 uses printed circuit board twist-lock socket bulbs, specifically the PC168 for most listed model years and the PC175 for the 1997 model year.
The PC168 and PC175 are both miniature T10 wedge bulbs rated at 12V and designed for printed circuit board sockets, though they carry distinct part designations and are not confirmed as interchangeable by the specifications.
The 1997 Saturn SL1 center high mount stop light is the sole model year in the listed data to use the PC175, while all surrounding years use the PC168.
All four bulb types listed, the 2057, 3157, PC168, and PC175, conform to ANSI standards applicable in both the US and Canada.