Nissan Quest Back Up Light Bulb Size

Additional Notes

• The Nissan Quest uses the 921 bulb for its back up light across the 2004-2017 model years, making it the most consistently specified bulb type in these specifications.
• The 921 is a T15 wedge-base bulb rated at 12 volts and 16 watts, conforming to ANSI standards applicable in both the United States and Canada.
• The T15 wedge base of the 921 bulb means it is retained by friction rather than a locking mechanism, a common trait in modern automotive lighting sockets.
• Earlier Nissan Quest model years show greater variation in back up light bulb types, with the 3156, 2456, and 2356 each appearing across the 1993-2002 range.
• The 3156 is a single-filament T25 wedge bulb rated at 12 volts and 27 watts, also ANSI-standardized, and it draws notably more power than the 921 used in later model years.
• The 2356 bulb, specified for the 1995 and 1998 Nissan Quest, uses a BAY15d bayonet base with dual filaments, a base type that is physically incompatible with wedge-style sockets.
• The 2456 is a festoon-style bulb rated at 12 volts and designated for specialty applications under ANSI standards, representing a physically distinct form factor from both wedge and bayonet bulbs.
• Because the 1993-2002 model years each carry different bulb specifications, substituting bulbs across those years without confirming the exact model year fitment risks an incompatible base type or wattage mismatch.
• The 921 and 3156 are both wedge-base bulbs, but their T15 and T25 designations indicate different physical sizes, meaning they are not interchangeable despite sharing the same base style.
• All four bulb types in these specifications, the 921, 2456, 3156, and 2356, are rated at 12 volts and conform to ANSI standards for the US and Canadian markets.