Ford P0191 OBD-II Trouble Code Definition: P0191 Fuel Rail Pressure Sensor P0191 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0191 Fuel Rail Pressure Sensor Circuit Range/Performance What does the code mean? OBD-ii Code P0191 definition: The Fuel Rail Pressure (FRP) sensor is a diaphragm strain gauge device in which resistance changes with pressure. The electrical resistance […]