Nissan Altima Stepwell Bulb Size

The Nissan Altima stepwell utilizes 194 and 12961 bulb sizes for illumination purposes within the interior cabin area. Available data covers a span of time starting from 2002 through 2023.

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

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
2022-2023	194	W5W	Check Price
2014-2019	194	W5W	Check Price
2009	12961	12961	Check Price
2002-2006	12961	12961	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194	Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with W2.1x9.5d wedge base. 12V, 5W.	W5W	Check Price
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961	Check Price

Other Locations

Additional Notes

The Nissan Altima stepwell position uses two distinct bulb sizes across its model years: the 194 and the 12961, both of which share the T10 miniature wedge form factor.
The 194 is an ANSI-standardized bulb used in the United States and Canada, rated at 12V and 3.78W, and fits the Nissan Altima stepwell for model years 2014-2019 and 2022-2023.
The 12961 is a Philips part number designation for a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W, and fits the Nissan Altima stepwell for model years 2002-2006 and 2009.
Although both bulbs share the T10 wedge profile, the 12961 draws 5W compared to the 194's 3.78W, meaning the two are not electrically identical despite their physical similarities.
The W2.1x9.5d base designation on the 12961 specifies a wedge base with a 2.1mm wire width and a 9.5mm insertion depth, which is the standard geometry for T10 wedge bulbs in this application.
The ANSI designation of the 194 indicates it conforms to a standardized specification maintained across multiple manufacturers, whereas the 12961 designation is specific to Philips and may have equivalent cross-reference numbers from other manufacturers.
The wattage difference between the two bulb types is a relevant fitment consideration, as substituting a 5W bulb in a circuit designed for a 3.78W bulb, or vice versa, may affect socket load tolerances.