The meaning of the B1938 Code is obligatory thing for solving the problem and real meaning of the code is very important thing that is unavoidable. The real meaning of the code can be identified by reading the manual of the car. The manual defines the manufacturer name and model number of the vehicle. The multi-displacement method stops the opposite pairs of cylinders what lets the engine to have 3 various configurations and displacements. The B1938 code had an extravagant diagnostics process, including showing engine codes on the air conditioning display. However, the system has problem, misinterpreted by customers, and a rash of random failures led to the technology being rapidly discharged.