BMW Parts Catalog Welcome to RealOEM! This site can be used to look up BMW part numbers and approximate part prices. The Parts are grouped into diagrams and diagrams are BMW · (0A02 BMW Engine Codes & BMW Chassis Codes | BimmerWorld BMW engine codes are designed to provide a lot of information about the engine design and technology in a short amount of space. Standard BMW engines use a "M", "N", or "B" code. BMW M models use an "S" code. The official motorsport Race engines use a "P" code. Click on an image below to view the breakdown for each engine family.