Audi S7 License Plate Bulb Size

The Audi S7 license plate light requires a unique bulb size of DE3423 for the rear exterior lighting assembly. Data for the specific bulb requirements covers the range from 2013 to 2014.

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
2013-2014	DE3423

Bulb Specifications

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

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Additional Notes

The DE3423 is the sole bulb type specified for the Audi S7 license plate position across the 2013-2014 model years.
The DE3423 follows the ANSI standard, which governs bulb specifications for the United States and Canada markets.
As a festoon-type bulb, the DE3423 seats between two end-cap contacts rather than using a bayonet or wedge base, requiring a holder designed specifically for that contact style.
The DE3423 has a 41mm length, which is a critical fitment factor, as festoon bulbs of differing lengths are not interchangeable even when voltage ratings match.
The DE3423 operates at 12 volts, consistent with standard automotive electrical systems.