For 1990-2009 cars

The engine code letter is the eight digit of the VIN, which identifies the engine.

Stick-on labels attached to the engine, laser etching, or stampings in the engine block indicate the engine unit number/build code date.

The engine ID number will be located on the end surface of the cam cover (1), and the VIN derivative is located on the engine block in front of the transaxle extension (2), as shown.