Pontiac Fiero front and rear turn signal bulbs utilize a 2057 bulb size across all applications. The replacement chart covers vehicle production spanning 1984 to 1988.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Pontiac Fiero uses the 2057 bulb for both front and rear turn signals across its entire production run of 1984-1988.
The 2057 is an ANSI-standardized bulb, meaning its specifications are consistent across manufacturers in the United States and Canada.
As a dual-filament bulb, the 2057 operates two independent filaments within a single housing, one rated at 26.9W for high-intensity signaling and one at 8W for lower-intensity functions.
The 2057 uses a BAY15d bayonet base, a two-pin offset base design that physically prevents incorrect insertion by positioning the two pins at different heights along the base.
The 2057 is a brighter variant of the 1157 bulb, sharing the same BAY15d base, which makes the two types physically interchangeable in many sockets.
Despite the physical interchangeability with the 1157, the 2057 and 1157 differ in wattage output, so substituting one for the other affects light intensity.
The 2057 operates on a 12V electrical system, consistent with standard automotive voltage.
The uniform use of the 2057 across all five model years means a single bulb type serves both the front and rear turn signal positions on the Fiero without variation.