Mercedes-Benz E350 License Plate Bulb Size

The Mercedes-Benz E350 license plate light uses bulb sizes 12961 and DE3423 according to the provided specifications. Available information covers the span from 2006 through 2014 for the listed vehicle components.

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	12961
2006-2007	DE3423

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423

Other Locations

Additional Notes

The Mercedes-Benz E350 uses two distinct bulb types for the license plate position across the 2006-2014 model years: the 12961 and the DE3423.
The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W.
The T10 wedge base design means the bulb is held in its socket by the tension of the base contacts rather than by a bayonet or screw mechanism.
The DE3423 is an ANSI-standard designation recognized in the United States and Canada, referring to a festoon-type bulb measuring 41mm in length with end-cap contacts, rated at 12V.
Festoon bulbs make electrical contact at both ends of the bulb body, a configuration distinct from the wedge base used by the 12961.
The E350 models from 2008-2014 use the 12961 bulb, while the 2006-2007 models use the DE3423.
The two bulb types are not interchangeable, as they differ in base design, physical form, and socket configuration.
The wattage of the DE3423 is not specified in the provided data, whereas the 12961 is explicitly rated at 5W.