INFINITI I30 Back Up Light Bulb Size

The INFINITI I30 back up light utilizes 921, 1156, and P21W bulb sizes depending on the specific version of the vehicle. Data for the lighting components covers the range from 1996 to 2001.

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
2000-2001	921
1996-1999	1156

Bulb Specifications

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

Other Locations

Additional Notes

The INFINITI I30 uses two distinct bulb types across its model years for the back up light position: the 921 and the 1156.
The 921 is a wedge-type bulb in the T15 form factor, rated at 12V and 16W, and conforms to ANSI standards applicable in the US and Canada.
The 1156 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W, and also conforms to ANSI standards applicable in the US and Canada.
The BA15s bayonet base of the 1156 and the wedge base of the 921 are physically incompatible mounting types, meaning the two bulbs are not interchangeable without a socket adapter.
The 1156 draws 21W compared to the 921's 16W, reflecting a difference in power consumption between the two bulb types.
The INFINITI I30 (1996-1999) uses the 1156 bulb for the back up light.
The 2000-2001 I30 uses the 921 bulb for the back up light, representing a change from the 1156 used in earlier model years.
The transition between bulb types at the 1999-2000 model year boundary means that parts sourced for earlier I30 vehicles are not socket-compatible with those from later model years.