The engine P0931 Code plays important role for solving the car engine. Read the car engine manual to know the cause of the car engine problem. Here, you will seek the real meaning of engine code what tells about the car engine problem. Do not drive the car with the car engine problem. The engine P0931 DTC reports a sensor fault, spare of the sensor is unlikely to resolve the primary problem. The fault is the most likely to be twisted by the schemes that the sensor is nursing, but might even be caused by the wiring to the sensor itself.