The B1345 Code provides information about the error of engine and this provide information of problem of the body of engine. It is necessary to fix the problem but to fix the problem of the engine, the engineer needs to know the model and manufacturer of the car. Because the same code is used for different models and manufacturers car. With these manual is also necessary to understand the problem well. Though fuel economy was raised, acceleration was really negotiated, and the loss of engine vacuum led to a hazardous loss of braking support when the B1345 code system was in four-cylinder mode.