Ford Focus Back Up Light Bulb Size

The Ford Focus back up light uses a 921 bulb size for the replacement component across multiple model generations. The replacement chart covers vehicle production spanning from 2008 to 2018.

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
2008-2018	921	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921	Check Price

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Additional Notes

The Ford Focus (2008-2018) uses the 921 bulb size for the back up light across all listed model years.
The 921 bulb follows the ANSI standard, which is the recognized specification body for bulb classifications in the United States and Canada.
This bulb uses a wedge-style base, designated T15, which refers to a tubular glass envelope roughly 15/8 inches wide with no separate metal base pins, relying instead on the glass envelope itself to make contact within the socket.
The 921 operates at 12 volts, consistent with the standard electrical system voltage found in conventional passenger vehicles.
At 16 watts, the 921 produces a moderate output level typical of reverse light applications, where broad illumination behind the vehicle is the primary function.
The wedge base design of the T15 means the bulb is not interchangeable with bayonet or screw-base sockets, and only sockets designed for wedge-type bulbs are compatible.