Mazda B4000 License Plate Bulb Size

The Mazda B4000 license plate light requires 194 and 168 bulb sizes for proper illumination of the rear vehicle identification area. Available information covers the time period from 1994 through 2009 for the specified automotive lighting components.

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
2006-2009	194
2003-2005	168
1994-2002	194

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The Mazda B4000 uses two bulb types across its license plate fitment history: the 194 and the 168, both of which are ANSI-standardized miniature wedge bulbs classified under the T10 form factor.
Both the 194 and 168 bulbs operate on a 12-volt system, which is standard for automotive electrical circuits of this type.
Although the 194 and 168 share the same T10 wedge form factor, they differ in wattage. The 194 draws 3.78W, while the 168 draws 4.9W, making them non-interchangeable despite their physical similarity.
The 194 bulb is the predominant fitment for the Mazda B4000, covering the 1994-2002 and 2006-2009 model years.
The 168 bulb applies specifically to the 2003-2005 model years of the Mazda B4000, representing a distinct fitment period within the production run.
The wattage difference between the two bulb types means that substituting a 168 for a 194, or vice versa, would result in a mismatch in power draw, even though both physically fit a T10 socket.
The ANSI standardization of both bulb types indicates that they conform to defined performance and construction criteria recognized across the United States and Canada.