Code P0051 Possible Causes
Heated Oxygen Sensor Bank 2 Sensor 1 circuit poor electrical connection
Heated Oxygen Sensor Bank 2 Sensor 1 fuse
Heated Oxygen Sensor Bank 2 Sensor 1 harness is open shorted
Faulty Engine Control Module ECM
Faulty Heated Oxygen Sensor H2OS Bank 2 Sensor 1