Audi TT License Plate Bulb Size

The Audi TT uses a DE3423 bulb for the license plate illumination area according to the provided technical specifications. Data for the specific component covers the range from 2000 to 2009.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2008-2014	DE3423
2000-2006	DE3423

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423

Other Locations

Additional Notes

The Audi TT uses the DE3423 bulb size for its license plate lighting across the 2000-2014 model years covered in these specifications.
The DE3423 is classified as a festoon bulb, meaning it is a cylindrical lamp that makes electrical contact through metal caps at both ends rather than through a base socket.
The DE3423 operates at 12 volts, which is consistent with standard 12V automotive electrical systems.
The festoon body of the DE3423 measures 41mm in length, a figure that determines physical fitment within the license plate lamp housing.
The DE3423 designation follows ANSI standards, indicating the bulb conforms to specifications recognized across the United States and Canada.
Because the same bulb size is specified across all listed model years of the Audi TT, the DE3423 is interchangeable between those years for license plate lighting purposes.