Ford Focus Trunk Bulb Size

Ford Focus trunk bulb utilizes 2 distinct sizes: 12961 and 6411, with each bulb serving specific lighting functions in the trunk area. The replacement chart covers vehicle production spanning 2008 to 2018, detailing bulb size specifications across this 10-year range.

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
2012-2018	12961
2008-2011	6411

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6411

Other Locations

Additional Notes

The Ford Focus trunk bulb specifications cover model years 2008-2018, with two distinct bulb types used across this range.
The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W.
The 6411 follows the ANSI standard used in the US and Canada, designating a festoon bulb with a 36mm length and SV8.5 base, also rated at 12V and 5W.
Both bulb types share identical voltage and wattage ratings of 12V and 5W, though their physical formats and base types are not interchangeable.
The T10 wedge format of the 12961 uses a pin-free base that wedges directly into the socket, while the 6411 festoon format seats between two spring-clip contacts at either end of the housing.
The Ford Focus (2012-2018) uses the 12961 T10 wedge bulb for the trunk.
The Ford Focus (2008-2011) uses the 6411 festoon bulb for the trunk.
The differing base types between the T10 wedge and the SV8.5 festoon mean that bulbs from the two groups cannot be substituted for one another without a socket adapter.