Toyota Prius Courtesy Bulb Size

The Toyota Prius utilizes a courtesy light component which requires a specific 168 bulb size for proper installation and function within the interior lighting system. Available data for the specified vehicle covers a continuous span 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	US Type	EU Type	Shop
2004-2018	168	W5W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168	Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with W2.1x9.5d wedge base. 12V, 5W.	W5W	Check Price

Other Locations

Additional Notes

The Toyota Prius uses the 168 bulb size for its courtesy lighting across the 2004-2018 model years.
The 168 bulb is classified under the ANSI standard, which applies to the United States and Canada markets.
This bulb follows the T10 form factor, a miniature wedge-base design that seats without a twist or locking mechanism, relying instead on socket tension to hold it in place.
The 168 operates at 12 volts and draws 4.9 watts, placing it in the low-wattage range typical of interior courtesy applications.
The T10 wedge base is a widely used format, meaning the 168 shares physical compatibility with several other bulb numbers in the same family, though wattage and voltage ratings should be matched before substitution.
The uninterrupted use of the same bulb size across all listed model years of the Toyota Prius indicates a stable socket specification throughout that production span.