Honda Accord Tail Light Bulb Size

The Honda Accord tail light utilizes bulb sizes 921 and 2057 according to the provided specifications for the lighting components. Data for the bulb sizes covers the range from 1976 to 2020.

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
2020	921
1990-1991	2057
1982-1985	2057
1976-1978	2057

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Brighter variant of 1157. 12V, 26.9W/8W.	2057

Other Locations

Additional Notes

The 2057 bulb is the most frequently specified tail light bulb across the Honda Accord entries in these specifications, appearing across 1976-1978 and 1982-1985 and 1990-1991 model years.
The 2057 is a dual-filament bulb rated at 12V with a high-filament draw of 26.9W and a low-filament draw of 8W, which allows it to serve both brake light and running light functions from a single unit.
The 2057 uses a BAY15d bayonet base, a two-pin offset base design that physically prevents incorrect filament orientation during installation.
The 2057 is described as a brighter variant of the 1157 bulb. While the two types share the BAY15d base and are often considered interchangeable, the 2057 draws more wattage on its high filament, producing greater output.
The 921 bulb is specified for the 2020 Honda Accord tail light, representing a shift to a wedge-style T15 form factor compared to the bayonet-base 2057 used in earlier model years.
The 921 is a single-filament wedge bulb rated at 12V and 16W. Its wedge base is inserted directly into a socket without a locking pin, relying on spring tension to maintain contact.
The 921 and 2057 are not interchangeable. They differ in base type, filament count, and wattage, meaning a socket designed for one will not accept the other.
Both the 921 and 2057 conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical tolerances within those markets.