P0040 Code – Oxygen Sensor Signal Swapped Bank 1 Sensor 1 Bank 2 Sensor 1

Code P0040 Possible Causes
Bank 1 Sensor 1 / Bank 2 Sensor 1 circuit connectors wrong connection
Bank 1 Sensor 1 / Bank 2 Sensor 1 harness is open or shorted
Faulty Engine Control Module ECM
Faulty Engine Control Module ECM
Faulty Heated Oxygen Sensor H2OS Bank 1 Sensor 3

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