Mitsubishi Montero Sport Back Up Light Bulb Size

The Mitsubishi Montero Sport back up light utilizes 1156 and P21W bulb sizes according to the provided specifications for the vehicle. Data for the specific bulb sizes covers the range from 1997 through 2004.

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
1997-2004	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

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Additional Notes

The 1156 bulb is the sole back up light bulb size listed for the Mitsubishi Montero Sport across all available model years in the specifications, spanning 1997-2004.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, which is consistent with its application as a dedicated back up light.
The bulb operates at 12 volts and 21 watts, placing it within the standard low-voltage automotive electrical range.
The 1156 uses a BA15s bayonet base, a single-contact mount where the "s" denotes a single pin, distinguishing it from the dual-contact BA15d variant.
The BA15s bayonet base requires a quarter-turn insertion rather than a threaded connection, which is the standard mounting method for this base type.
The 1156 carries ANSI standardization applicable in both the United States and Canada, indicating the bulb conforms to a defined set of electrical and physical tolerances recognized across North American markets.
Because the 1156 is a single-filament type, it is not interchangeable with visually similar bulbs such as the 1157, which uses a dual-filament design and a BA15d base with two offset pins.