Ford Expedition Back Up Light Bulb Size

The Ford Expedition back up light utilizes bulb sizes 3057, 921, 2356, 3156, and 2456 depending on the specific version of the vehicle. Available data covers the range from 1997 through 2023 for the components listed.

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
2019-2023	3057
2007-2018	921
2006	2356
2005	3156
2003-2004	2456
2002	2356
2001	2456
2000	2356
1999	2456
1998	3156
1997	2456

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3057
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V.	2356
ANSI standard (US & Canada). Single-filament wedge bulb (T25). 12V, 27W.	3156
ANSI standard (US & Canada). Festoon bulb, specialty application. 12V.	2456

Other Locations

Additional Notes

The Ford Expedition backup light specifications cover model years 1997 through 2023, with five distinct bulb sizes used across that span: 3057, 921, 2356, 3156, and 2456.
The 921 is the most frequently specified bulb across this range, covering the Ford Expedition from 2007 through 2018. It is a single-filament wedge bulb in a T15 form factor, rated at 12V and 16W, and follows the ANSI standard applicable in the US and Canada.
The 3057 bulb is specified for the 2019-2023 Ford Expedition. It is a dual-filament wedge bulb in a T25 form factor, rated at 12V with a 27W main filament and a 7W secondary filament. The presence of two filaments distinguishes it from the single-filament 3156, despite both sharing the T25 form factor.
Because the 3057 and 3156 share the same T25 wedge base and identical 27W main filament wattage, they are physically interchangeable in the socket, but the 3057 carries an additional 7W filament that the 3156 does not. Substituting one for the other may affect intended circuit behavior.
The 921 and 3057 are not interchangeable. The 921 uses a smaller T15 wedge base, while the 3057 uses a larger T25 wedge base, making socket fitment incompatible between the two.
The 2456 is a festoon-style bulb rated at 12V and is designated for specialty applications. It was specified for the Expedition in 1997, 1999, 2001, 2003-2004. A festoon bulb is cylindrical with end-cap contacts rather than a wedge or bayonet base, making it physically distinct from all other bulb types in these specifications.
The 2356 uses a BAY15d bayonet base and is a dual-filament bulb rated at 12V. It was specified for the Expedition in 2000, 2002, and 2006. The BAY15d base type is mechanically incompatible with wedge or festoon sockets.
The 3156 is a single-filament wedge bulb in a T25 form factor, rated at 12V and 27W. It was specified for the Expedition in 1998 and 2005, making it one of the least frequently occurring bulb sizes in these specifications.
All five bulb sizes listed conform to ANSI standards recognized in the US and Canada, meaning each carries a standardized designation that defines its electrical and physical characteristics independently of any manufacturer-specific part numbering.
The model years 1997 through 2006 show variation across four different bulb sizes, with no single type used in consecutive years throughout that period, indicating that backup light socket design changed multiple times during early Expedition production.