The engine C1165 Code is related with the car engine and meaning of the code is necessary to know. The C1165 engine code seems a kind of chassis problem and it is not very difficult to solve the problem. Even the problem of the car engine can be fixed at low rate. When the fuel use was increased, hurrying was cooperated, and the loss of engine vacuum led to a unsafe loss of slowing assist when the C1165 code system was in 4-cylinder mode. Moreover, these issues, while the company planned a hydraulically measured system that could be switched from within the car, the version they realized had to be manually different in the engine section using hand tools.