Mercedes-Benz SLK280 Back Up Light Bulb Size

The Mercedes-Benz SLK280 back up light requires bulb size P21W or 1156 depending on the specific application. Data for the provided specifications covers the range from 2006 to 2008.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2006-2008	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The Mercedes-Benz SLK280 uses the 1156 bulb for the back up light position across the 2006-2008 model years.
The 1156 is an ANSI-standardized bulb type, meaning its physical and electrical specifications follow a defined North American standard recognized in both the US and Canada.
This bulb operates on a 12-volt circuit and draws 21 watts, which is consistent with standard automotive reverse light applications.
The 1156 is a single-filament bulb, meaning it serves only one lighting function, as opposed to dual-filament types that handle two functions such as braking and running light simultaneously.
Its base type is the BA15s bayonet mount, where "BA" denotes a bayonet cap, "15" refers to the 15mm base width, and the lowercase "s" indicates a single contact pin at the base.
The BA15s base is not interchangeable with the BA15d base, which carries two contact pins and is used for dual-filament applications. Substituting one for the other is not possible without modification.