Saturn LW300 front and rear turn signal bulbs utilize 3457NA or 3457 bulb sizes for the front position and P21W bulb size for the rear position. 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 LW300 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 3457NA differs from the 3457 in that its glass envelope is tinted natural amber, which produces an amber signal output without relying on a colored lens.
Because the 3457 and 3457NA share the same T25 wedge base and electrical ratings, they are physically interchangeable, though substituting a clear 3457 where a 3457NA is specified may alter the color output at the lens.
The Saturn LW300 rear turn signal 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, which is a single-contact base with a 15mm collar.
The front turn signal bulbs follow the ANSI standard used in the United States and Canada, while the rear turn signal bulb follows the ECE standard used in Europe and internationally, reflecting a mixed-standard fitment on this vehicle.
The P21W is a single-filament bulb, meaning it serves only one lighting function per socket, whereas the dual-filament 3457 and 3457NA can serve two functions from a single housing.
The BA15s bayonet base of the P21W is not compatible with the wedge base of the 3457 or 3457NA, making the front and rear turn signal bulbs non-interchangeable on the LW300.