Ford Freestar front turn signal bulbs use 3457NA or 3357NA sizes, while rear turn signal bulbs use 4157 or 3157 sizes. The replacement chart covers 2004 through 2007 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 Ford Freestar uses four distinct bulb types across its front and rear turn signal positions for the 2004-2007 model years: the 3457NA, 3357NA, 4157, and 3157.
Three of the four bulb types, the 3457NA, 4157, and 3157, share identical electrical ratings of 12V with a dual-filament output of 27W/7W, meaning the higher-wattage filament serves the turn signal function while the lower-wattage filament serves a secondary function such as parking or running light.
The 3357NA, used in the front turn signal position on the 2006 Ford Freestar, is a single-filament bulb rated at 12V and 27W, which distinguishes it from the dual-filament 3457NA used in all other Freestar model years for that same position.
All four bulb types conform to the ANSI standard applicable in both the United States and Canada, and all share the T25 wedge base form factor.
The "NA" suffix on the 3457NA and 3357NA designates natural amber glass, meaning the amber color is produced by the glass envelope itself rather than by a clear bulb operating behind an amber lens.
The front turn signal position on the Ford Freestar uses the 3457NA for 2004-2005 and 2007, while the 2006 model year uses the 3357NA. Despite sharing the T25 base, these two bulbs are not interchangeable due to the difference in filament count and wattage configuration.
The rear turn signal position transitions from the 3157 for 2004-2005 to the 4157 for 2006-2007. Both are dual-filament T25 wedge bulbs with identical voltage and wattage ratings, though they carry different ANSI part numbers indicating a distinction in their physical or electrical specifications.