The Audi TT side marker utilizes a specific 12961 bulb size for illumination purposes within the lighting assembly. Data for the specified component covers the range from 2000 to 2006.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H6W is an ECE-standard single-filament signalling bulb rated at 12V and 6W, fitted with a BAX9s base. It serves as the front side marker bulb on the Audi TT across the 2000-2006 and 2008-2010 model years.
The BAX9s base uses offset pins to prevent incorrect bulb insertion, which distinguishes it from other 9mm bayonet cap types that are physically similar but not interchangeable.
For the 2008-2010 model years, the H6W front side marker fitment is specifically noted as applying to vehicles equipped with HID headlamps, indicating a conditional compatibility tied to headlamp type.
The rear side marker position on the Audi TT (2000-2006) uses the 12961, a Philips part number designating a T10 miniature wedge bulb rated at 12V and 5W with a W2.1x9.5d base.
The T10 wedge format of the 12961 is a friction-fit design that requires no rotation during installation, relying on the wedge-shaped base to maintain contact within the socket.
The H6W and 12961 operate at different wattages, 6W and 5W respectively, and use entirely different base types, meaning the two bulbs are not interchangeable between front and rear side marker positions.
The front and rear side marker positions on the Audi TT draw from two distinct bulb families, one following ECE signalling standards and the other following a miniature wedge format common in North American automotive applications.