The B1392 Code is a sign of error of engine and it seems that the problem of the engine started due to the body of the engine. It is necessary to check the issue. For this reason, you need to take the car to auto repair store where all expensive machineries available for solving the problem. You cannot fix the problem if you do not know how to fix it if you do not have all necessary machineries. The problem seems started from the body of engine. It is easy to fix and for fixing, you may not need to change any expensive componenet.