The Audi 200 brake light utilizes a P21/5W bulb size for illumination during vehicle operation. Data for the specified lighting component covers the range from 1989 to 1991.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Audi 200 uses the P21/5W bulb for brake lighting across the 1989-1991 model years.
The P21/5W is a dual-filament bulb rated at 12V with a 21W filament for stop signaling and a 5W filament for running light functions, housed in a BAY15d bayonet base.
The BAY15d base features offset pins, which physically prevents incorrect single-filament bulbs from being seated in the socket, making substitution with single-filament equivalents incompatible.
The P21/5W follows ECE standards, a regulatory framework used across Europe and numerous other markets worldwide.
The center high mount stop light on the Audi 200 uses the 12961 bulb across the 1989-1991 model years, a specification distinct from the brake bulb used in the main stop lamps.
The 12961 is a Philips part number designating a T10 miniature wedge bulb rated at 12V and 5W, fitted with a W2.1x9.5d wedge base.
The W2.1x9.5d wedge base is a single-filament configuration, reflecting the center high mount stop light's dedicated stop-only function rather than a combined stop and running light role.
The T10 wedge form factor of the 12961 is physically incompatible with the BAY15d bayonet socket used by the P21/5W, meaning the two bulb types serve entirely separate lamp positions and are not interchangeable.