Ford Fiesta front and rear side marker bulbs utilize 168, 194, and 3157 bulb sizes depending on location and model generation. The replacement chart covers vehicle production spanning 1978 to 2019.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford Fiesta uses three distinct bulb types across its side marker positions: the 168, 194, and 3157, all of which conform to ANSI standards recognized in the United States and Canada.
The 168 and 194 are both miniature wedge bulbs sharing the T10 form factor, which means they occupy the same physical socket class, though their wattage ratings differ at 4.9W and 3.78W respectively.
Despite the shared T10 form factor between the 168 and 194, the two are not interchangeable on the Ford Fiesta, as each is specified for a distinct model year range within the front side marker position.
The front side marker on the Ford Fiesta (2014-2019) takes the 168 bulb, a 12V, 4.9W T10 miniature wedge type.
The front side marker on the 1978-1980 Fiesta takes the 194 bulb, a 12V, 3.78W T10 miniature wedge type.
The 3157 is a dual-filament wedge bulb in the T25 form factor, rated at 12V with a high filament of 27W and a low filament of 7W, making it physically and electrically distinct from the T10 types used elsewhere in the same vehicle's marker system.
The rear side marker on the Ford Fiesta (2014-2019) uses the 3157, a notably higher-wattage bulb than those specified for any front side marker position across all listed years.
The 1978-1980 Fiesta rear side marker also uses the 194 bulb, the same type specified for the front side marker of those same years, indicating a single bulb type served both marker positions on that generation.
The dual-filament nature of the 3157 allows it to serve multiple lighting functions within a single housing, which is consistent with its use in rear marker positions where combined stop and marker operation is common.