Ford Focus Tail Light Bulb Size

Ford Focus tail light bulb sizes include 3157 and 3057, with each bulb size corresponding to specific vehicle configurations. The replacement chart covers 2008 through 2018 model years and details bulb size specifications aligned with production periods.

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
2012-2018	3157	Check Price
2010-2011	3057	Check Price
2008-2009	3157	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157	Check Price
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3057	Check Price

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Additional Notes

The Ford Focus tail light specifications cover model years 2008-2018, with the 3157 bulb type appearing in the majority of those years.
The 3157 is an ANSI-standardized dual-filament wedge bulb in the T25 form factor, rated at 12V with a 27W high filament and a 7W low filament, making it suitable for combined stop and tail light functions within a single housing.
The 3057 shares the same ANSI classification, T25 form factor, and 12V/27W/7W electrical ratings as the 3157, meaning both bulbs are electrically identical on paper.
Despite their identical voltage and wattage ratings, the 3157 and 3057 are not fully interchangeable in all sockets due to differences in their contact configurations, which affect physical fitment.
The Ford Focus (2011-2012) uses the 3057 rather than the 3157 specified for surrounding model years, representing a fitment distinction that requires attention when sourcing a replacement bulb for those two years specifically.
Both the 3157 and 3057 are governed by ANSI standards applicable in the United States and Canada, meaning bulbs sourced within those markets are expected to conform to defined performance tolerances for those part numbers.
The dual-filament design of both bulb types allows a single bulb to serve two lighting functions, typically running light operation on the low-wattage filament and brake light operation on the high-wattage filament.