Audi S8 License Plate Bulb Size

The Audi S8 license plate requires a bulb with the unique size DE3423 for proper illumination. Data for the specified component covers the range from 2001 through 2013.

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
2013	DE3423
2007-2009	DE3423
2001-2003	DE3423

Bulb Specifications

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

Other Locations

Additional Notes

The DE3423 is the sole bulb type specified for the Audi S8 license plate position across all listed model years.
The DE3423 is a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base or pins.
Festoon bulbs are held in place by spring-loaded clips within the lamp housing, with the end caps pressing against the contacts at both ends of the cavity.
The DE3423 has a specified length of 41mm, which is a critical fitment factor, as festoon bulbs must match the span between the contact clips in the housing to seat correctly.
The bulb operates at 12 volts, consistent with standard automotive electrical systems.
The DE3423 carries ANSI standardization applicable to the United States and Canada, meaning its physical and electrical characteristics conform to a defined North American specification.
The Audi S8 license plate position uses the DE3423 across model years 2001-2003 and 2007-2009, as well as 2013.
Because the DE3423 is an ANSI-standardized part, bulbs from different manufacturers sharing the same designation are generally interchangeable, provided the 41mm length and end-cap contact design are maintained.