Toyota Prius Tail Light Bulb Size

The Toyota Prius tail light utilizes 12961 and 7443 bulb sizes for the specific components listed in the provided data set. Information covers the range from 2001 through 2009 for the specified vehicle and lighting equipment.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Outer Tail Light

Years	US Type	EU Type	Shop
2009	194 (To 03/2009)	W5W	Check Price
2004-2008	194	W5W	Check Price
2001-2003	7443	W21/5W	Check Price

Tail Light

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
2004-2009	12961	12961	Check Price
2001-2003	7443	W21/5W	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
ANSI standard (US & Canada). Dual-filament wedge bulb (T20). 12V, 21W/5W.	7443	Check Price
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961	Check Price

Other Locations

Additional Notes

The Toyota Prius outer tail light specifications cover model years 2001-2009 and reference three distinct bulb types across that span: the 194, the 7443, and the 12961.
The 7443 is a dual-filament T20 wedge bulb rated at 12V with a 21W/5W output, meaning one filament draws 21 watts and the other draws 5 watts. This ANSI-standard bulb serves both outer tail light positions on the 2001-2003 Prius.
The 194 is a single-filament T10 miniature wedge bulb rated at 12V and 3.78W. It is an ANSI-standard type used in the United States and Canada, and it appears in one of the two outer tail light positions on the 2004-2009 Prius.
The 12961 is a Philips part number rather than an ANSI designation. It describes a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W, and it occupies the second outer tail light position on the 2004-2009 Prius alongside the 194.
Although the 194 and the 12961 share the T10 wedge form factor, their wattage ratings differ: the 194 draws 3.78W while the 12961 draws 5W. These two bulbs are not rated identically and occupy separate positions within the same assembly.
The 2009 Toyota Prius carries a production-date qualifier for the 194 bulb, specifying fitment only up to March 2009. This indicates a mid-year specification change within that model year.
The transition from the 7443 to the 194 and 12961 pairing occurred between the 2003 and 2004 model years. The 7443 is a dual-filament bulb, while both replacement types are single-filament, reflecting a change in how tail light functions were distributed across the assembly.