The Mercedes-Benz E55 AMG front turn signal requires a 2357NA or 1156NA bulb size, while the rear turn signal uses a P21W or 1156NA bulb size. The replacement chart covers 1999 to 2006 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.
The Mercedes-Benz E55 AMG front turn signal uses two distinct bulb types across its model years, with the 1156NA specified for 1999-2003 and the 2357NA specified for 2004-2006.
The 2357NA is a dual-filament bulb rated at 26.9W and 8W on its respective filaments, operating at 12V with a BAY15d bayonet base and natural amber glass coating.
The BAY15d base on the 2357NA features two offset pins, which physically prevents it from being interchanged with single-filament bulbs that use the BA15s base.
The 1156NA is a single-filament bulb rated at 21W and 12V, fitted with a BA15s bayonet base and natural amber glass, conforming to the ANSI standard used in the United States and Canada.
Both the 1156NA and P21W share the BA15s bayonet base and identical 12V, 21W electrical ratings, meaning they are electrically equivalent despite originating from different standards bodies.
The P21W follows the ECE standard, which is used in Europe and internationally, whereas the 1156NA follows the ANSI standard applicable to the US and Canadian markets.
The rear turn signal on the Mercedes-Benz E55 AMG transitions from the 1156NA in 1999 to the P21W for 2000-2003, reflecting a shift from an ANSI-rated bulb to its ECE-rated equivalent.
The natural amber glass on both the 2357NA and 1156NA produces the amber turn signal color directly from the bulb itself, rather than relying on a colored lens to filter a clear light source.
The P21W does not carry a natural amber designation in its specification, indicating it is a clear-glass bulb whose amber output depends on the vehicle's amber-tinted lens housing.
Substituting a 2357NA for a 1156NA in a single-filament application is not supported by the base compatibility, as the BAY15d and BA15s bases are physically distinct and non-interchangeable.