The Honda CR-V brake light uses unique bulb sizes 7440, 921, 7443, and P21/5W depending on the specific version of the vehicle. Available data covers a range from 1997 through 2022 for the specified lighting components.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7443 is the most frequently specified brake bulb across the Honda CR-V lineup, appearing in the standard brake position from 1997 through 2016 and in the Outer Brake position across most of that same span.
The 7443 is a dual-filament T20 wedge bulb rated at 12V with a 21W high filament and a 5W low filament, making it suitable for combined brake and tail light functions within a single housing.
The 7440 is a single-filament T20 wedge bulb rated at 12V, 21W. It shares the same T20 wedge base as the 7443 but carries only one filament, which means the two types are not interchangeable despite their physical similarity.
The 7440 is specified for the Center High Mount Stop Light on the Honda CR-V from 1997 through 2011, and it also appears as the standard brake bulb for the 2022 model year.
The 921 is a T15 wedge bulb rated at 12V, 16W. It is a smaller form factor than the T20-based 7440 and 7443, and it is specified for the standard brake position on the 2019 and 2021 CR-V.
Because the 921 uses a T15 base while the 7440 and 7443 use a T20 base, none of these three bulb types are physically interchangeable with one another despite sharing the same 12V operating voltage.
The P21/5W uses a BAY15d bayonet base rather than a wedge base, which makes it physically incompatible with the 7443 even though both are rated at 12V, 21W/5W with dual filaments.
The P21/5W follows the ECE standard used in Europe, while the 7440, 7443, and 921 follow the ANSI standard used in the United States and Canada. On the Honda CR-V, P21/5W fitment is associated with vehicles of GBR origin.
For the 2002-2006 CR-V, the standard brake bulb specification splits by vehicle origin: JPN-origin vehicles take the 7443, while GBR-origin vehicles take the P21/5W. The same origin-based split is reflected in the Outer Brake position for several of those years.
The Outer Brake position on the CR-V uses the P21/5W for 2002-2003 and 2005-2006, but reverts to the 7443 for 2004, indicating that the bayonet-base and wedge-base bulbs occupied the same functional position in different production configurations.