Where is the engine number of Audi A4 located?

[Shelley]

The engine number of the A4 is located on the inclined surface of the cylinder block at the rear end of the engine where it connects to the transmission. The engine model is an identification code assigned by the engine manufacturer in accordance with relevant regulations, corporate or industry practices, and the attributes of the engine. It is used to represent information such as the manufacturer, specifications, performance, features, technology, purpose, and production batch of the engine, including fuel type, number of cylinders, displacement, and static braking power. The engine model is an identification code assigned by the engine manufacturer in accordance with relevant regulations, corporate or industry practices, and the attributes of the engine. It is used to represent information such as the manufacturer, specifications, performance, features, technology, purpose, and production batch of the engine, including fuel type, number of cylinders, displacement, and static braking power. Engines installed in passenger cars or multi-purpose passenger vehicles are required to clearly indicate the professional manufacturer, model, and production number of the engine. It is important to note that the engine number is not the same as the engine model. The engine model refers to the specifications and size of the engine within the manufacturer's product line, and multiple engines can share the same model. The engine number, however, refers to the production number of the engine, and each engine has a unique number that cannot be duplicated. Composition of the vehicle engine number: Prefix: Includes product series code, generation symbol, and regional or corporate code. Manufacturers can choose the appropriate letters as needed, but they must be approved and recorded by the industry standard regulatory body. Middle section: Consists of symbols for the number of cylinders, cylinder arrangement, stroke, and cylinder diameter. Rear section: Composed of symbols for structural features and usage characteristics. Suffix: Distinguishing symbol. When differentiation is needed within the same series due to improvements or other reasons, the manufacturer selects an appropriate symbol. The rear section and suffix can be separated by a hyphen (-).