BMW 540i Turn Signal Bulb Size
The BMW 540i uses multiple turn signal bulb sizes across front and rear positions, including 3157 for the front inner, 12961 for the front outer, 12496 and PY21W for front applications, and PY21W or P21W for rear locations. The replacement chart covers 1994 through 2020 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Front Inner Turn Signal
| Years | Bulb Size |
|---|---|
| 1997-2000 | 3157 |
Front Outer Turn Signal
| Years | Bulb Size |
|---|---|
| 1997-2000 | 12961 |
Front Turn Signal
| Years | Bulb Size |
|---|---|
| 2020 | 12496 (Without Adaptive Lighting) |
| 2019 | 12496 (Without Adaptive Headlamps) |
| 2017-2018 | PY21W (Without Adaptive Lighting) |
| 2001-2003 | 3457NA |
| 1999-2000 | 3157 (Front) |
| 12961 (Side) | |
| 1998 | 3157 |
| 12961 (Side) | |
| 1997 | 3357NA (Front) |
| 12961 (Side) | |
| 1994-1995 | P21/5W |
Rear Turn Signal
| Years | Bulb Size |
|---|---|
| 2002-2003 | PY21W |
| 1997-2001 | P21W |
| 1994-1995 | P21W |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W. | 3157 |
| Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W. | 12961 |
| Philips/Osram part number. Halogen bulb, specialty application. 12V. | 12496 |
| ECE standard (Europe & worldwide). Single-filament amber bulb with BAU15s bayonet base. 12V, 21W. | PY21W |
| ANSI standard (US & Canada). Dual-filament wedge bulb (T25), natural amber glass. 12V, 27W/7W. | 3457NA |
| ANSI standard (US & Canada). Single-filament wedge bulb (T25), natural amber glass. 12V, 27W. | 3357NA |
| 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 BA15s bayonet base. 12V, 21W. | P21W |