Ford Fiesta Parking Light Bulb Size

Ford Fiesta parking light bulbs utilize 2 distinct sizes: 3157NA and 1157, with the bulb specifications varying across vehicle production generations. The replacement chart covers data spanning from 1978 to 2019, detailing which bulb size corresponds to each model year.

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	3157NA
1978-1980	1157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25), natural amber glass. 12V, 27W/7W.	3157NA
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157

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Additional Notes

The Ford Fiesta parking light specifications cover two distinct eras: the 1978-1980 models and the 2014-2019 models, each using a different bulb type.
The 3157NA is the parking light bulb for the 2014-2019 Ford Fiesta. It is a dual-filament wedge bulb in the T25 form factor, rated at 12V with a 27W high filament and 7W low filament.
The "NA" suffix in the 3157NA designation indicates natural amber glass, meaning the amber color is produced by the glass envelope itself rather than by an external coating or a colored lens.
The 1157 is the parking light bulb for the 1978-1980 Ford Fiesta. It is also a dual-filament bulb rated at 12V, but with a lower output of 21W and 5W on its respective filaments.
The 1157 uses a BAY15d bayonet base, while the 3157NA uses a wedge-style base. These two base types are physically incompatible, and the bulbs are not interchangeable between the two Fiesta generations.
Both the 3157NA and the 1157 conform to ANSI standards applicable in the United States and Canada, classifying them as standardized bulbs within the North American automotive market.
The 3157NA carries a notably higher wattage on its primary filament (27W) compared to the 1157 (21W), reflecting a difference in light output between the two bulb types.
A standard 3157 bulb shares the same T25 wedge base and dual-filament configuration as the 3157NA, but it has a clear glass envelope. Substituting a 3157 for a 3157NA in the 2014-2019 Fiesta would alter the color output of the parking light.