Saturn LW200 front turn signal bulbs use 3457NA or 3457 size, while rear turn signal bulbs use P21W size. The replacement chart covers 2001 to 2003 model 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 LW200 front turn signal uses the 3457 bulb for the 2001-2002 model years and the 3457NA for the 2003 model year.
Both the 3457 and 3457NA are ANSI-standard dual-filament T25 wedge bulbs rated at 12V with a 27W main filament and a 7W secondary filament.
The key distinction between the 3457 and 3457NA is that the 3457NA features natural amber-tinted glass, which produces an amber output without relying on an amber lens.
Because the 3457NA and 3457 share the same T25 wedge base and electrical ratings, the physical fitment is identical across the 2001-2003 front turn signal positions.
The rear turn signal on the Saturn LW200 uses the P21W bulb across all three model years, 2001-2003.
The P21W is an ECE-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base.
The BA15s designation indicates a single-contact bayonet base with a 15mm collar, which is not interchangeable with dual-contact bayonet bases such as the BA15d.
The P21W follows ECE regulations used in Europe and worldwide markets, while the 3457 and 3457NA follow ANSI standards applied in the United States and Canada.
The front and rear turn signal positions on the LW200 use bulbs from two different international standards, meaning the front and rear bulbs are not interchangeable with each other.
The single-filament design of the P21W means the rear turn signal circuit on the LW200 is dedicated solely to signalling, with no secondary function sharing the same bulb.