The BMW 650i front inner turn signal requires a 7440NA bulb size, while front turn signals use either 12188 or 7440NA bulb sizes, and rear turn signals require a PY21W bulb size. The replacement chart covers vehicle production years spanning 2006 to 2015 with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The BMW 650i turn signal specifications cover two distinct generation ranges: the 2006-2007 model years and the 2012-2015 model years, with each generation using different bulb types across its signal positions.
The 7440NA is a single-filament wedge bulb following the T20 form factor, rated at 12V and 21W, and built to the ANSI standard used in the United States and Canada. Its natural amber glass produces the required signal color without relying on a colored lens or housing.
The PY21W is a single-filament amber bulb rated at 12V and 21W, built to the ECE standard used in Europe and worldwide. It uses a BAU15s bayonet base, which has offset pins to prevent incorrect installation in sockets designed for that fitting.
Although the 7440NA and PY21W share the same voltage and wattage ratings, they are not interchangeable. The 7440NA uses a wedge base while the PY21W uses a BAU15s bayonet base, making the two physically incompatible with each other's sockets.
On the 2006-2007 BMW 650i, the 7440NA bulb serves both the front inner turn signal and the front turn signal positions, while the PY21W is specified exclusively for the rear turn signal.
The 12188 is a Philips part number designating a 12V halogen bulb for specialty applications. It is specified for the front turn signal on the 2012-2015 BMW 650i equipped with HID headlamps.
The HID headlamp condition attached to the 12188 specification indicates that front turn signal fitment on the 2012-2015 650i is dependent on the headlamp system installed, meaning vehicles without HID headlamps fall outside this particular specification entry.