Mercedes-Benz 400E front side marker bulbs use P21/5W size while rear side marker bulbs use 5008 size. The replacement chart covers 1992 to 1993 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 400E uses two distinct bulb types across its front and rear side marker positions for the 1992-1993 model years, with each position requiring a different bulb standard.
The P21/5W is an ECE-standard bulb used in the front side marker position. It operates on a dual-filament design, meaning it carries two separate filaments within a single envelope, rated at 21W and 5W respectively.
The P21/5W uses a BAY15d bayonet base. The BAY15d designation indicates an offset pin configuration, which physically prevents the bulb from being seated incorrectly and ensures the two filaments align with their intended circuits.
The rear side marker position on the 400E uses the 5008, an ANSI-standard bulb common to North American applications. Unlike the front marker bulb, the 5008 is a single-filament type.
The 5008 uses a BA15s bayonet base, which features two pins at equal heights. This base type is not interchangeable with the BAY15d base found on the P21/5W, as the pin offsets differ between the two.
The 5008 is a lower-wattage variant of the 1156 bulb family. While both share the BA15s base, the reduced wattage of the 5008 makes it a non-equivalent substitute for the 1156 in applications where output levels are a factor.
The front and rear side marker bulbs on the 400E operate under different international standards, with the front position following ECE regulations and the rear following ANSI specifications, reflecting a mixed-standard fitment across the vehicle.