Ford Fiesta Tail Light Bulb Size

Ford Fiesta tail light bulb sizes include 3157 and 97, representing the unique bulb dimensions required for this vehicle model's rear lighting assembly. The replacement chart covers vehicle production spanning 1978 to 2019, documenting bulb specifications across 4 decades of manufacturing data.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2014-2019	3157
1978-1980	97

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 13W.	97

Other Locations

Additional Notes

The Ford Fiesta tail light uses two distinct bulb types across its listed model years: the 3157 for 2014-2019 and the 97 for 1978-1980.
The 3157 is the more frequently specified bulb across the Ford Fiesta tail light data, covering six consecutive model years from 2014 to 2019.
The 3157 is a dual-filament T25 wedge bulb rated at 12V with a 27W high filament and a 7W low filament, conforming to the ANSI standard used in the US and Canada.
Its dual-filament design allows a single 3157 bulb to serve two lighting functions simultaneously, such as running light and brake light operation, within one housing.
The 97 bulb is a single-filament type rated at 12V and 13W, mounted via a BA15s bayonet base, and also conforms to the ANSI standard for the US and Canadian markets.
The BA15s bayonet base on the 97 bulb is a single-contact fitting, which is mechanically distinct from the wedge base of the 3157 and makes the two bulbs physically non-interchangeable.
The 97 is classified as a variant of the 1156 bulb family, though its 13W rating is lower than the standard 1156, which typically operates at 26.9W.
Because the 3157 and 97 differ in base type, filament count, and wattage, neither can serve as a substitute for the other in Ford Fiesta tail light sockets.