Ford Focus Daytime Running Light Bulb Size

The Ford Focus daytime running light bulb uses a 3157 size for vehicles in this generation. The replacement chart covers 2008 to 2011 model 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.

Bulb Size by Year Range

Years	Bulb Type	Shop
2008-2011	3157	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157	Check Price

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Additional Notes

The Ford Focus uses the 3157 bulb for the daytime running light position across the 2008-2011 model years.
The 3157 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are governed by a recognized North American standard used in the United States and Canada.
The 3157 is a dual-filament bulb, which means it contains two separate filaments within a single housing, each operating at a different wattage: 27W for the higher-intensity filament and 7W for the lower-intensity filament.
The T25 designation refers to the wedge-style base of the 3157 bulb, which seats directly into a socket without requiring a separate bayonet or screw fitting.
The 3157 operates on a 12V electrical system, consistent with standard automotive voltage.
Because the 3157 is a dual-filament type, substituting it with a single-filament bulb of a similar size would result in the loss of one lighting function, as the two filaments serve distinct circuit roles.
The 3157 shares its T25 wedge base with several related bulb types in the 3000-series family, such as the 3156 (single-filament) and 3057 (dual-filament, lower wattage), though these variants are not interchangeable without accounting for filament count and wattage differences.