Also called the manufacturer's reference, OEM means in English Original Equipment Manufacturer. The OS reference is created by the vehicle manufacturer, several manufacturers' references can correspond to the same part. It is important to verify that the manufacturer's reference of your original part is in the list of compatible references of the product that you will order. By comparing the OEM reference noted on your original part to the list of compatible references on our ads you are sure to buy the product compatible with your vehicle. The best solution to find the reference of your part is to note it directly on your original part. If the part is a butterfly body, a pressure sensor or an idle regulator, which are easy to access parts, it will be easy to note the reference, or if the.