The Mercedes-Benz E300 parking light requires H6W or P21/5W bulb sizes depending on the specific version of the vehicle. Data for the bulb sizes covers the range from 1995 to 1999.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercedes-Benz E300 front parking light uses the H6W bulb for the 1996-1999 model years.
The H6W is an ECE-standard single-filament signalling bulb rated at 12 volts and 6 watts, fitted with a BAX9s base.
The BAX9s base is an offset-pin cap design, which physically prevents substitution with bulbs using standard axial-pin bases.
The 1995 Mercedes-Benz E300 front parking light uses the P21/5W bulb instead of the H6W.
The P21/5W is an ECE-standard dual-filament signalling bulb rated at 12 volts, with filaments rated at 21 watts and 5 watts respectively, fitted with a BAY15d bayonet base.
The BAY15d base uses two offset pins at different heights to ensure correct filament orientation during installation, and it is not interchangeable with the BAX9s base used by the H6W.
The wattage difference between the H6W (6W) and the P21/5W (5W parking filament) is minor in practical terms, though the two bulbs remain physically and electrically incompatible due to their differing base types.
Both the H6W and P21/5W conform to ECE regulations, meaning they are approved for road use across Europe and other markets that adopt ECE lighting standards.