Saturn SL front turn signal bulbs utilize 3457NA, 3157NA, or 3057NA sizes, while rear turn signal bulbs use 3157 or 1156 sizes depending on production specifications. The replacement chart covers 1991 through 2002 model years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Saturn SL front turn signal uses the 3457NA bulb for the 1995-2002 model years, the 3157NA for 1993-1994, and the 3057NA for 1991-1992.
The 3457NA, 3157NA, and 3057NA bulbs all share the same T25 wedge form factor, dual-filament design, natural amber glass, and 12V/27W/7W electrical rating under the ANSI standard.
Natural amber glass in the NA-suffix bulbs produces an amber output without the need for an amber-tinted lens, as the color is built into the glass envelope itself.
The dual-filament construction in the 3457NA, 3157NA, and 3057NA bulbs supports two independent brightness levels, with the 27W filament typically serving the turn signal function and the 7W filament serving a parking or running light function.
Although the 3457NA, 3157NA, and 3057NA share identical electrical ratings and the same T25 wedge base, they carry distinct ANSI part numbers and are not confirmed as interchangeable by these specifications.
The Saturn SL rear turn signal uses the 1156 bulb across the 1991-1999 model years, while the 3157 bulb is specified for 2000-2002.
The 1156 bulb uses a BA15s bayonet base, which is a single-contact bayonet mount, making it physically incompatible with the wedge-base socket used by the 3157.
The 3157 rear turn signal bulb used in 2000-2002 is a dual-filament T25 wedge bulb rated at 12V/27W/7W, whereas the 1156 it replaced in prior years is a single-filament bulb rated at 12V/21W.
The base change from BA15s bayonet (1156) to T25 wedge (3157) between the 1999 and 2000 model years indicates a socket change in the rear turn signal housing of the Saturn SL.
The 3157 rear turn signal bulb for 2000-2002 does not carry the NA suffix, meaning it has a clear glass envelope rather than natural amber glass, unlike its front-position counterparts.