Mazda MPV Back Up Light Bulb Size

The Mazda MPV back up light utilizes 921, 7440, 1156, and P21W bulb sizes depending on the specific production version. Available information covers a range of years starting from 1989 through 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
2003-2006	921
2000-2002	7440
1989-1998	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921
ANSI standard (US & Canada). Single-filament wedge bulb (T20). 12V, 21W.	7440
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The Mazda MPV backup light specifications cover model years 1989 through 2006, with three distinct bulb sizes used across that span depending on the production year.
The 1156 bulb is the most widely used type in these specifications, fitting the Mazda MPV across 1989-1998. It is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W.
The BA15s bayonet base on the 1156 bulb uses a single contact pin, which is a defining fitment characteristic that distinguishes it from visually similar bayonet-base bulbs with offset or dual pins.
The 7440 bulb applies to the 2000-2002 model years. It is a single-filament wedge bulb in the T20 form factor, also rated at 12V and 21W, matching the 1156 in wattage but differing entirely in base type.
Because the 7440 uses a wedge base rather than a bayonet base, it is not physically interchangeable with the 1156 despite sharing the same voltage and wattage ratings.
The 921 bulb applies to the 2003-2006 Mazda MPV. It is a wedge bulb in the T15 form factor, rated at 12V and 16W, making it the lowest-wattage bulb among the three types listed in these specifications.
The T15 form factor of the 921 and the T20 form factor of the 7440 are both wedge-base types, but their different sizes mean they are not interchangeable with each other despite sharing the same base style.
All three bulb sizes listed, the 921, 7440, and 1156, conform to ANSI standards applicable in both the United States and Canada.
A transition in bulb type occurs between the 1998 and 2000 model years, where the specification shifts from the 1156 bayonet-base bulb to the 7440 wedge-base bulb, representing a change in both base type and form factor.
A second transition occurs between the 2002 and 2003 model years, where the specification shifts from the 7440 T20 wedge bulb to the 921 T15 wedge bulb, accompanied by a reduction in rated wattage from 21W to 16W.