BMW X5 License Plate Bulb Size

The BMW X5 license plate requires a DE3423 bulb size for the lighting component located at the rear of the vehicle. Provided information covers the time range from 2000 through 2013.

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
2000-2013	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 BMW X5 uses the DE3423 bulb for the license plate position across the 2000-2013 model years.
The DE3423 is a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base socket.
Festoon bulbs are held in place by spring-loaded clips within the housing, which grip the end caps to maintain both mechanical retention and electrical connection.
The DE3423 has a rated length of 41mm, which is the span between the two end contacts and determines physical fitment within the license plate lamp housing.
The bulb operates on a 12-volt circuit, consistent with the standard electrical system voltage found in passenger vehicles.
The DE3423 designation follows ANSI standards applicable in the United States and Canada, meaning the bulb conforms to a defined set of dimensional and electrical tolerances established by that classification.
Because the DE3423 is an ANSI-standardized type, it is interchangeable with other bulbs sharing the same designation regardless of manufacturer, provided the 41mm length and end-cap contact configuration are maintained.
Festoon bulbs of differing lengths are not interchangeable even when voltage ratings match, as an incorrect length will prevent proper contact with the spring clips in the housing.