Code P0056 Possible Causes
Heated Oxygen Sensor Bank 2 Sensor 2 circuit fuse
Heated Oxygen Sensor Bank 2 Sensor 2 circuit poor electrical connection
Heated Oxygen Sensor Bank 2 Sensor 2 harness is open shorted
Faulty Engine Control Module ECM
Faulty Heated Oxygen Sensor H2OS Bank 2 Sensor 2