Ford P1143 OBD-II Trouble Code Definition: P1143 Heated Oxygen Sensor 1 Lean Shift Monitoring Bank 1 P1143 Ford OBD-II Trouble CodeDescription: Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1143 OBD Code Description Heated Oxygen Sensor 1 Lean Shift Monitoring Bank 1 is one of the definitions for the P1143; however your vehicle’s […]