The C1231 Code helps to solve the engine problem and if the real meaning of the code is not used, it becomes difficult to solve the car engine problem. You need not to know the general meaning but you can learn something from the general meaning. If you follow the general meaning for solving the engine problem. It may create more problem. The engine C1231 engine code a kind of chassis problem and it is easy fix. Do not follow any common meaning of the code for solving the car engine problem. A test drive is recommended after solving the car engine problem.