BMW 640i Back Up Light Bulb Size
The BMW 640i back up light requires a 921 bulb size for proper installation and function within the rear lighting assembly. Available data for the specified vehicle covers the range from 2012 to 2018.
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 | US Type | EU Type | Shop |
|---|---|---|---|
| 2012-2018 | 921 | W16W | Check Price |
Bulb Specifications
| Description | Type | Shop |
|---|---|---|
| ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W. | 921 | Check Price |