The engine P0406 Code is a necessary thing and by the meaning of the code, the engine can be fixed properly. Due to the wrong use of the car engine code, new problems may start in the car engine. The engine should not be remain unfixed and do not use unnecessary meaning for solving the car engine. The powertrain problem of the car engine is not difficult thing to solve. You do not need to use spend much money for solving the car engine. The engineer must use tools and expertise for solving the car engine. Once the car engine is ok, a test drive is recommended.