Mercury Sable front turn signal bulbs use 3457NA or 1157 size, while rear turn signal bulbs use 3157NA, 3157, or 1157 size configurations. The replacement chart covers 1986 through 2009 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 Mercury Sable front turn signal uses the 3457NA bulb for the 2008-2009 and 1996-1999 model years, while the 1986 model year uses the 1157 bulb instead.
The rear turn signal follows a similar split: the 2008-2009 model years use the 3157NA, the 1996-1999 model years use the 3157, and the 1986 model year uses the 1157.
The 3457NA and 3157NA are both dual-filament T25 wedge bulbs rated at 12V with a 27W high-filament and 7W low-filament output, and both feature natural amber glass rather than a clear envelope.
The natural amber glass in the 3457NA and 3157NA produces an amber signal color directly from the bulb itself, without relying on a colored lens to achieve the required turn signal hue.
The 3157 shares the same T25 wedge form and 12V/27W/7W electrical rating as the 3157NA but has a clear glass envelope, making it dependent on an amber lens for color output.
The 1157 uses a BAY15d bayonet base rather than a wedge base, which makes it physically incompatible with sockets designed for T25 wedge bulbs such as the 3457NA, 3157NA, or 3157.
The 1157 is rated at 12V with a 21W high-filament and 5W low-filament output, placing its wattage below that of the T25 wedge bulbs used in later Mercury Sable model years.
All four bulb types listed are dual-filament designs, meaning each bulb serves two lighting functions within a single housing, typically combining turn signal and parking light duties.
All bulbs in these specifications conform to ANSI standards recognized in both the United States and Canada, indicating a shared North American regulatory framework for these part numbers.
The front and rear positions of the Mercury Sable do not share the same bulb type across any model year covered in these specifications, as the front and rear sockets are fitted with different part numbers throughout.