Volkswagen Scirocco front turn signal bulbs use P21/5W size while rear turn signal bulbs use P21W size. The replacement chart covers vehicle production spanning 1975 to 1988.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Volkswagen Scirocco uses two distinct bulb types across its front and rear turn signal positions for the 1975-1988 model years: the P21/5W at the front and the P21W at the rear.
The P21/5W is a dual-filament bulb rated at 12V with a 21W main filament and a 5W secondary filament, mounted on a BAY15d bayonet base.
The BAY15d base features two offset pins, a design that prevents incorrect installation by ensuring the bulb can only be seated in one orientation.
The P21W is a single-filament bulb rated at 12V and 21W, mounted on a BA15s bayonet base, which uses a single contact pin.
Because the P21/5W and P21W use different bayonet bases, BAY15d and BA15s respectively, the two bulb types are not interchangeable between the front and rear positions.
Both the P21/5W and P21W conform to ECE standards, indicating they are approved for use in Europe and other markets that follow ECE lighting regulations.
The front turn signal position of the Volkswagen Scirocco specifies the P21/5W across all listed model years from 1975-1988, with no variation in bulb type across that span.
The rear turn signal position similarly specifies the P21W without variation across the full 1975-1988 range covered in the specifications.