Mitsubishi Tredia License Plate Bulb Size

The Mitsubishi Tredia license plate light requires a 257 bulb size for proper illumination of the rear registration area. Available data for the specified component covers the range from 1983 to 1988.

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
1983-1988	257

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon or BA9s base instrument bulb. 12V, 2W.	257

Other Locations

Additional Notes

The Mitsubishi Tredia uses the 257 bulb for its license plate light across all documented model years, spanning 1983-1988.
The 257 is an ANSI-standardized bulb type, meaning its specifications are governed by a formal industry standard recognized in both the United States and Canada.
This bulb operates at 12 volts and draws 2 watts, placing it among the lower-wattage bulbs found in automotive lighting applications.
The 257 is compatible with either a festoon base or a BA9s base, which are two distinct socket types, making physical fitment verification necessary before installation.
A festoon bulb is cylindrical in shape and makes contact at both flat ends, while a BA9s bulb uses a small single-pin bayonet base, meaning the two base types are not interchangeable with each other despite sharing the same 257 designation.
The 257 is classified as an instrument bulb, a category typically associated with low-intensity, small-form lighting tasks such as illuminating panels, indicators, and license plates.