Honda Civic Brake Bulb Size

The Honda Civic brake light utilizes 7440 and 2057 bulb sizes depending on the specific version of the vehicle being serviced for maintenance. Information provided covers a range from 1973 through 2024 to assist with identifying the correct components for various models.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Brake

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
2024	7440	W21W	Check Price
1986-1991	2057	2057	Check Price
1973-1983	2057	2057	Check Price

Center High Mount Stop Light

Years	US Type	EU Type	Shop
1986-1991	921	W16W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament wedge bulb (T20). 12V, 21W.	7440	Check Price
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Brighter variant of 1157. 12V, 26.9W/8W.	2057	Check Price
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921	Check Price

Other Locations

Additional Notes

The Honda Civic brake light specifications reference three distinct bulb types across the listed model years: the 7440, 2057, and 921.
The 2057 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with a high-intensity filament drawing 26.9W and a low-intensity filament drawing 8W. It is an ANSI-standard bulb recognized in both the US and Canada, and it serves as a brighter variant of the more widely known 1157.
The 7440 is a single-filament wedge bulb in the T20 form factor, rated at 12V and 21W. As a single-filament type, it does not support dual-intensity operation the way the 2057 does.
The 921 is a wedge bulb in the T15 form factor, rated at 12V and 16W, and also carries ANSI recognition for the US and Canadian markets.
The Honda Civic uses the 2057 for the brake light position across model years 1973-1991, with the exception of 2024, which uses the 7440 instead.
The 7440 and 2057 are not interchangeable. The 7440 uses a wedge base while the 2057 uses a BAY15d bayonet base, and their filament configurations differ, making physical and electrical compatibility between the two types incompatible.
The 921 appears exclusively in the center high mount stop light position on the Honda Civic for model years 1986-1991, a separate lamp position from the primary brake lights that use the 2057 during the same period.
The 921 and 7440 are both single-filament wedge bulbs but belong to different T-series form factors, T15 and T20 respectively, and are not interchangeable with each other or with the BAY15d-based 2057.