The Genuine BMW Courtesy Light Bulb - 63217167000 is a replacement light bulb designed for use in BMW vehicles. This bulb is specifically used for the courtesy lights, which are typically located in the interior of the car and provide illumination when the doors are opened. The bulb has a standard size and wattage, making it easy to install in compatible BMW models. It is a genuine OEM (Original Equipment Manufacturer) part, ensuring high quality and compatibility with your vehicle. This courtesy light bulb is an essential component for maintaining proper lighting and functionality in your BMW.