The engine P0158 Code is really an important thing and you need to know the right meaning for solving the car engine problem. Do not use any meaning of the code for solving the car engine problem. You have to follow the right meaning of the code and that meaning is related with your car manufacturer. Do not use or follow wrong meaning. Due to the use of the wrong meaning of the code, you may face terrible problem in the car engine. Do not drive the car until the car engine is fixed. You should take the car for a test drive.