BMW 545i License Plate Bulb Size

The BMW 545i license plate light requires a unique bulb size identified as DE3423 for the rear exterior illumination. Data for the specific component covers the range from 2004 to 2005.

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
2004-2005	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 DE3423 is the bulb type specified for the BMW 545i license plate position across the 2004-2005 model years.
The DE3423 follows the ANSI standard, which is the North American classification system used in the United States and Canada, distinguishing it from ECE-rated bulbs used in other markets.
As a festoon bulb, the DE3423 seats horizontally within a housing and makes electrical contact through metal end caps at both ends of the tube rather than through a base socket.
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 bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of this type.