Mercedes-Benz SLK230 License Plate Bulb Size

The Mercedes-Benz SLK230 license plate light requires a DE3423 bulb size for proper installation and function. Available data for the specified component covers the range from 1998 through 2004.

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
1998-2004	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 SLK230 uses the DE3423 bulb for the license plate position across all listed model years, spanning 1998-2004.
The DE3423 is a festoon-type bulb, meaning it is cylindrical in shape with flat metal contacts at each end rather than a screw or bayonet base.
Festoon bulbs are held in place by spring-loaded clips within the housing, with the end-cap contacts completing the circuit at both terminals.
The DE3423 has a specified length of 41mm, which is a critical fitment factor, as festoon bulbs must match the span of the socket clips to make proper contact.
The bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of this type.
The DE3423 designation follows ANSI standards recognized in both the United States and Canada, indicating the bulb conforms to a defined set of dimensional and performance criteria in those markets.
Because the DE3423 is an ANSI-standardized part, it is produced by multiple manufacturers, and any compliant 41mm festoon bulb meeting the DE3423 specification is generally considered a direct replacement.
Festoon bulbs of differing lengths, such as 36mm or 44mm variants, are not interchangeable with the DE3423 even if they share a similar appearance, as the end-cap contacts would not align correctly with the socket clips.