The Saturn SC2 front turn signal uses a 3457NA or 2057 bulb size, while the rear turn signal requires a 1156 bulb size. The replacement chart covers 1993 to 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 SC2 front turn signal uses two distinct bulb types across its production span, with the 2057 fitted to 1993-1996 models and the 3457NA fitted to 1997-2002 models.
The 3457NA is a dual-filament T25 wedge bulb rated at 12V with a 27W high filament and 7W low filament, produced to ANSI standards for the US and Canadian markets.
The natural amber glass of the 3457NA is an integral part of the bulb construction, meaning the amber color is built into the glass envelope rather than produced by a colored lens or coating.
The 2057 is a dual-filament bulb using a BAY15d bayonet base, rated at 12V with a 26.9W high filament and 8W low filament, also conforming to ANSI standards.
The 2057 is a brighter variant of the 1157, sharing the same BAY15d base type, which means the two bulbs are physically similar but not electrically identical and are not direct substitutes for one another.
The Saturn SC2 rear turn signal uses the 1156 across all model years from 1993-2002, making it the only rear turn signal bulb specified for this vehicle.
The 1156 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W, conforming to ANSI standards for the US and Canadian markets.
The BA15s base of the 1156 and the BAY15d base of the 2057 are physically distinct, as the BAY15d features offset pins to prevent incorrect installation, while the BA15s uses symmetrical pins.
The front turn signal bulb change between the 1996 and 1997 Saturn SC2 represents a shift from a BAY15d bayonet base to a T25 wedge base, meaning the two bulb types are not interchangeable across that model year boundary.
All three bulb types specified for the Saturn SC2 operate on a 12V electrical system and conform to ANSI standards applicable in both the United States and Canada.