Ford P0056 OBD-II Trouble Code Definition: P0056 HO2S Heater Control Circuit Bank 2 Sensor 2 P0056 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0056 HO2S Heater Control Circuit What does the code mean? OBD-ii Code P0056 definition: Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F […]