Subaru Legacy Stepwell Bulb Size

The Subaru Legacy stepwell light uses bulb sizes 12961 and 194 according to the provided specifications for the interior lighting components. Information for the specific vehicle covers the range from 2010 through 2024.

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
2024	12961
2021-2023	194
2010-2019	12961

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194

Other Locations

Additional Notes

The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12 volts and 5 watts. The 194 is an ANSI-standard designation used in the US and Canada, also a T10 miniature wedge bulb, rated at 12 volts and 3.78 watts. Both share the T10 form factor and wedge base type, making them physically similar in construction.
Despite sharing the T10 wedge form factor, the 12961 and 194 carry different wattage ratings. The 12961 draws 5 watts while the 194 draws 3.78 watts, a difference that reflects distinct electrical load characteristics between the two bulb types.
The Subaru Legacy stepwell uses the 12961 bulb across the 2010-2019 model years, as well as the 2024 model year. This makes the 12961 the more widely specified of the two bulb types across the Legacy's stepwell fitment history covered in these specifications.
The 194 bulb is specified for the Subaru Legacy stepwell in the 2021-2023 model years. Its ANSI designation means it conforms to a standardized North American specification rather than a manufacturer-specific part number.
The W2.1x9.5d base designation on the 12961 describes a wedge-type base where 2.1 refers to the wire contact width in millimeters and 9.5 refers to the base length in millimeters. This base type is common across many T10 miniature bulbs used in automotive interior lighting.
Although the 12961 and 194 are both T10 wedge bulbs and may fit the same socket physically, their differing wattage ratings mean they are not confirmed interchangeable across all model years in these specifications. Each year carries a distinct bulb designation that reflects the original equipment requirement for that vehicle.