Mercedes-Benz S420 Turn Signal Bulb Size
The Mercedes-Benz S420 front turn signal requires a 2357NA or 1157 bulb size, while the rear turn signal uses a PY21W, 12496, or 1156NA bulb size. The replacement chart covers 1994 to 1999 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 Turn Signal
| Years | Bulb Size |
|---|---|
| 1995-1999 | 2357NA |
| 1994 | 1157 |
Rear Turn Signal
| Years | Bulb Size |
|---|---|
| 1999 | PY21W |
| 1998 | 12496 |
| 1997 | 1156NA |
| 1996 | P21W |
| 1994-1995 | 1156NA |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, natural amber glass. 12V, 26.9W/8W. | 2357NA |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W. | 1157 |
| ECE standard (Europe & worldwide). Single-filament amber bulb with BAU15s bayonet base. 12V, 21W. | PY21W |
| Philips/Osram part number. Halogen bulb, specialty application. 12V. | 12496 |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base, natural amber glass. 12V, 21W. | 1156NA |
| ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W. | P21W |