The Mercedes-Benz SLK32 AMG front turn signal requires 3457NA or 2357NA bulb sizes, while the rear turn signal uses 1156NA bulb size. The replacement chart covers 2002 to 2004 model production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercedes-Benz SLK32 AMG uses three distinct bulb types across its front and rear turn signal positions: the 3457NA, 2357NA, and 1156NA, all of which conform to ANSI standards recognized in the United States and Canada.
All three bulb types feature natural amber glass, which produces the amber turn signal color directly from the bulb itself rather than relying on a colored lens.
The rear turn signal position uses the 1156NA across the 2002-2004 model years. This is a single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base.
The front turn signal position uses the 2357NA for the 2002-2003 model years. This is a dual-filament bulb rated at 12V with filaments drawing 26.9W and 8W respectively, fitted with a BAY15d bayonet base.
The BAY15d base found on the 2357NA is an offset-pin bayonet mount, which physically prevents incorrect filament orientation during installation, distinguishing it from the single-pin BA15s base on the 1156NA.
For the 2004 model year, the Mercedes-Benz SLK32 AMG front turn signal position specifies the 3457NA instead of the 2357NA. The 3457NA is also a dual-filament bulb rated at 12V with filaments drawing 27W and 7W, but it uses a wedge-style T25 base rather than a bayonet mount.
Because the 2004 front turn signal uses a wedge base (3457NA) while the 2002-2003 model years use a bayonet base (2357NA), these two bulb types are not interchangeable despite both being dual-filament natural amber bulbs.
The wattage split between the two filaments differs between the 3457NA (27W/7W) and the 2357NA (26.9W/8W), reflecting slightly different electrical draw profiles across the base change introduced in 2004.
The 1156NA single-filament design means it carries no secondary filament function, making it unsuitable as a direct replacement in any position that requires dual-filament operation, such as the front turn signal positions on this vehicle.