The Mercedes-Benz ML430 tail light utilizes a P21/4W bulb size for the rear lighting assembly. Data for the specified bulb covers the range from 1999 to 2001.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The P21/4W is the sole bulb type specified for the Mercedes-Benz ML430 outer tail light across the 1999-2001 model years.
The P21/4W is an ECE-standard bulb, meaning it conforms to the Economic Commission for Europe regulatory framework used in European and worldwide automotive lighting applications.
This bulb operates on a 12-volt electrical system, which is standard for passenger vehicles of this era.
The P21/4W carries a dual-filament design, with one filament rated at 21 watts and a second rated at 4 watts, allowing a single bulb to serve two distinct lighting functions within the same housing.
The BAZ15d bayonet base is an offset twin-contact fitting. The asymmetric pin placement of the BAZ15d prevents incorrect insertion, ensuring the higher-wattage and lower-wattage filaments are connected to their correct circuits.
The BAZ15d base is not interchangeable with the more common BA15s or BA15d bayonet bases. Substituting a bulb with a different base type would result in an incompatible fit for the ML430 outer tail light socket.