Ford Contour front turn signal bulbs use 3357NA, 3457NA, or 2357NA sizes, while rear turn signal bulbs require 3157 or 1157 sizes. The replacement chart covers 1995 to 2000 production 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 Contour front turn signal uses three distinct bulb types across its production run, with the 2357NA fitted to the 1995-1998 model years, the 3457NA fitted to 1999, and the 3357NA fitted to 2000.
The 2357NA, 3457NA, and 3457NA bulbs all carry the "NA" suffix, which denotes natural amber glass. This coloring produces an amber output without the need for an amber-tinted lens.
The 3357NA, used in the 2000 Ford Contour front turn signal position, is a single-filament T25 wedge bulb rated at 12V and 27W, meaning it operates only in an on/off state with no secondary brightness level.
The 3457NA, used in the 1999 front turn signal position, is a dual-filament T25 wedge bulb rated at 12V with a 27W high filament and a 7W low filament, allowing it to serve both a bright signal function and a dimmer running light function.
Although the 3357NA and 3457NA share the same T25 wedge base and identical high-filament wattage, they are not interchangeable. The 3357NA is single-filament while the 3457NA is dual-filament, so substituting one for the other in a dual-filament application would result in the loss of one lighting function.
The 2357NA uses a BAY15d bayonet base rather than a wedge base, making it physically incompatible with the T25 wedge sockets used by the 3357NA and 3457NA despite all three bulbs serving the same front turn signal position on the Contour.
The rear turn signal position on the Ford Contour transitioned from the 1157 bulb, used on 1995-1997 models, to the 3157 bulb, used on 1998-2000 models.
The 1157 rear turn signal bulb uses a BAY15d bayonet base and is rated at 12V with a 21W high filament and a 5W low filament, while the 3157 uses a T25 wedge base and is rated at 12V with a 27W high filament and a 7W low filament. The two bulbs differ in both base type and wattage, making them non-interchangeable.
Both the 2357NA front bulb and the 1157 rear bulb share the BAY15d bayonet base, though their wattage ratings differ. The 2357NA is rated at 26.9W/8W while the 1157 is rated at 21W/5W, so the shared base type does not make them interchangeable across positions.
All five bulb types referenced in these specifications conform to ANSI standards applicable in both the United States and Canada.