Ford P0391 OBD-II Trouble Code Definition: P0391 Camshaft Position Sensor B Circuit Range/Performance Bank 2 P0391 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0391 Camshaft Position Sensor “B” Circuit Range/Performance What does the code mean? OBD-ii Code P0391 definition: The optical sensor provides a high resolution signal to the Powertrain Control Module (PCM) by counting pulses […]