Mercedes-Benz S420 License Plate Bulb Size

The Mercedes-Benz S420 license plate light requires a bulb with the specific size DE3423 for proper installation and function. Available data for the specified vehicle covers the range from 1994 through 1999.

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 Type	Shop
1994-1999	DE3423	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423	Check Price

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Additional Notes

The Mercedes-Benz S420 uses the DE3423 bulb for the license plate position across all listed model years, spanning 1994-1999.
The DE3423 is a festoon-type bulb, meaning it is cylindrical in shape with metal contact caps at each end rather than a base socket. This end-cap contact design requires the bulb to be held under spring tension between two contact points within the housing.
The DE3423 has a length of 41mm, which is a standard festoon size. Installing a festoon bulb of a different length risks poor contact, intermittent illumination, or physical damage to the housing.
The DE3423 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of this type.
The DE3423 carries an ANSI designation, indicating it conforms to a standardized specification recognized in the United States and Canada. This means the bulb is subject to defined performance and dimensional standards rather than being a proprietary part.
Because the same bulb size applies uniformly to the Mercedes-Benz S420 from 1994-1999, there are no year-specific fitment variations within this range that would affect part selection.