How to find out whether a BMW headlight is original or not is as follows.

1. Check the lamp itself: BMW original headlights usually have the BMW trademark or logo printed on the lamp holder or lamp housing. If there is no logo or the logo is different from other lamps, it is not an original accessory.

2. Find the accessory number: You can check the vehicle manual or contact an authorized BMW dealer to ask for the lamp accessory number. The number of the original part is usually unique, if the number you find does not match this information, it is not the original part.

3. Look for certification marks: BMW original headlights usually have certification marks, such as OEM (Original Equipment Manufacturer) or OES (Original Equipment Supplier) marks. If the fixture you find does not have these markings on it, it is not an original part.