Ford P1086 OBD-II Trouble Code Definition: P1086 Exhaust Bank 4- Mixture Adaption Range 2 Lower Lean Limit Not Reached P1086 Ford OBD-II Trouble CodeDescription: Causes – Faulty Oxygen Sensor– Oxygen Sensor harness is open or shorted– Oxygen Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) […]