The engine code can tell about the terrible problem of the engine and that is why you need to get the meaning of the code. The engine P0471 Code is also found in the car engine and you need to use the right meaning of the code to find the problem and location. Some common problems of this code are Exhaust pressure sensor failure, Powertrain Control Module (PCM) failure and Wiring issue. The Exhaust Pressure Sensor tells the engine control module (PCM) is in the finish manifold. If the PCM controls there is an improper signal from the Use Pressure Sensor, the PCM will set code P0471.