Toyota Prius Stepwell Bulb Size

The Toyota Prius stepwell utilizes a 168 bulb size for illumination purposes within the interior cabin area. Data provided for the specific component covers a continuous range from 2004 through 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 Size
2004-2018	168

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

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Additional Notes

The Toyota Prius uses the 168 bulb size for the stepwell position across the 2004-2018 model years.
The 168 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American standard applicable in both the United States and Canada.
The 168 bulb belongs to the T10 form factor, a miniature wedge-base type. The wedge base design means the glass envelope itself acts as the retention mechanism, with no separate metal base or pins.
The 168 operates at 12 volts and draws 4.9 watts, placing it in the low-wattage range typical of interior courtesy and accent lighting applications.
Because the 168 shares the T10 wedge base with several other bulb numbers in the same family, fitment of physically similar bulbs with different wattage ratings would alter the electrical load and light output from the factory specification.