BMW Z4 Brake Bulb Size

The BMW Z4 brake light utilizes 921, P21/5W, and P21/4W bulb sizes depending on the specific version of the vehicle. Data for the bulb sizes covers the range from 2003 to 2016.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Brake

YearsBulb Size
2009-2016921 (Adaptive)
2007-2008P21/5W (Adaptive)
2003-2006P21/4W

Inner Brake

YearsBulb Size
2006-2008H21W

Outer Brake

YearsBulb Size
2006-2008P21W

Bulb Specifications

Description Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.921
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.P21/5W
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAZ15d bayonet base. 12V, 21W/4W.P21/4W
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAY9s base. 12V, 21W.H21W
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.P21W

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