Ford Explorer Sport Trac Back Up Light Bulb Size

The Ford Explorer Sport Trac back up light uses bulb sizes 2356, 2456, and 3156 depending on the specific version of the vehicle. Available data for the lighting components covers the range from 2001 to 2010.

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
2009-2010	2456
2008	3156
2007	2456
2004-2005	2456
2001-2003	2356

Bulb Specifications

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

Other Locations

Additional Notes

The Ford Explorer Sport Trac uses three distinct back up light bulb types across its model years: the 2456, 3156, and 2356, all of which conform to ANSI standards recognized in both the United States and Canada.
The 2456 is a festoon-style bulb rated at 12V and is designated for specialty applications. It is the most frequently specified bulb for the Explorer Sport Trac, appearing across the 2004-2005 and 2007, 2009-2010 model years.
The 2356 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V. Its dual-filament design distinguishes it from the single-filament 3156, meaning the two are not interchangeable despite both being 12V bulbs.
The 2356 was the specified back up light bulb for the 2001-2003 Explorer Sport Trac model years.
The 3156 is a single-filament wedge bulb of the T25 form factor, rated at 12V and 27W. It was specified exclusively for the 2008 model year.
The BAY15d bayonet base of the 2356 is a twist-and-lock mount with two offset pins, which is physically incompatible with the wedge-style base of the 3156 and the festoon mount of the 2456.
The festoon form factor of the 2456 requires a holder that grips the bulb at both ends, a mounting style that differs from both the bayonet base of the 2356 and the wedge base of the 3156, making cross-substitution between these types a fitment concern.
The 2008 model year stands apart from all surrounding years in its use of the 3156 wedge bulb rather than the 2456 festoon bulb, indicating a housing or socket change specific to that production year.