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 stamping in the engine block indicate the engine unit number/build code date.
The primary location for the engine ID is on front of the rocker cover (1) for the 2.2 L (L61) engine.
The primary location for the engine ID is on top of the rocker cover (1) for the 2.2 L (LN2) engine.
The primary (2) and secondary (3) hand stamp locations for the Vehicle Identification Number (VIN).
The 2.4 L VIN derivative and Engine ID (1) is located on the left side of the engine block next to the starter motor.
The primary location for the engine ID is on top of the timing chain cover (1) for the 2.4 L (LD9) engine.