Engine Number

The engine number ("engine code" and "serial number") are located at the engine to transmission joint.

Fig 1: Locating Engine Number ("Engine Code" And "Serial Number")

Courtesy of VOLKSWAGEN UNITED STATES, INC.

The engine code is also stamped on the cylinder block behind the oil filter.

Vehicles with Four Digit Engine Codes 

Four digit engine codes beginning with the letter "C" are used. The first three digits describe the mechanical structure of the engine and are still stamped on the engine, as before. The fourth digit describes the engine output and torque and depends on the Engine Control Module (ECM). Four digit engine codes are found on the type plate and vehicle data label. It can also be read via the ECM.