Scion xA License Plate Bulb Size

The Scion xA license plate light requires a 168 bulb size for proper installation and function. Data for the specified lighting component covers the period from 2004 to 2006.

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
2004-2006	168

Bulb Specifications

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

Other Locations

Additional Notes

The T10 miniature wedge is the bulb type used across all listed years of the Scion xA for the license plate position, spanning the 2004-2006 model years.
The T10 designation refers to a tubular glass envelope roughly 10 millimeters wide, fitted with a wedge-style base that seats directly into a socket without requiring a separate metal cap or bayonet pins.
The 168 operates at 12 volts and consumes 4.9 watts, placing it in the low-wattage range typical of exterior illumination bulbs that run continuously whenever the parking or headlights are active.
The 168 is an ANSI-standardized type recognized in both the United States and Canada, meaning the specification follows a defined industry standard rather than a proprietary or manufacturer-specific designation.
Because the 168 is a wedge-base bulb, fitment depends on socket shape and cavity size rather than a locking mechanism, so physical interference with the housing is a relevant consideration when substituting equivalent types.
The T10 wedge format is shared by several ANSI bulb numbers, including the 194 and 147, which differ in wattage. The 168 at 4.9 watts is not interchangeable with higher-wattage T10 variants without accounting for the increased heat output relative to the original socket rating.