Possible causes – Faulty Air Fuel Ratio (A/F) Sensor 1 Bank 1– Engine Control Module (ECM) program outdated– Air Fuel Ratio (A/F) Sensor 1 Bank 1 harness is open or shorted– Air Fuel Ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection Tech description Replacing the Air Fuel Ratio Sensor 1 Bank 1 usually…