BMW 325i Brake Bulb Size
BMW 325i brake bulbs utilize multiple sizes including P21W, P21/5W, H21W, and P21/4W depending on location, with the center high mount stop light and outer brake positions requiring P21W bulbs. The replacement chart covers vehicle production spanning 1988 to 2006 with corresponding bulb size specifications for each model year.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Brake
| Years | Bulb Size |
|---|---|
| 2006 | P21W |
| 2002-2005 | P21W (Adaptive) |
| 2001 | P21W |
| 1995 | P21/5W |
| 1993-1994 | P21W |
| 1988-1991 | P21W |
Center High Mount Stop Light
| Years | Bulb Size |
|---|---|
| 1993-1995 | P21W |
| 1988-1991 | P21W |
Inner Brake
| Years | Bulb Size |
|---|---|
| 2006 | H21W |
| 2001-2005 | P21/4W |
Outer Brake
| Years | Bulb Size |
|---|---|
| 2001-2006 | P21W |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W. | P21W |
| ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W. | P21/5W |
| ECE standard (Europe & worldwide). Single-filament signalling bulb with BAY9s base. 12V, 21W. | H21W |
| ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAZ15d bayonet base. 12V, 21W/4W. | P21/4W |