Possible causes – Faulty Exhaust Gas Temperature Sensor– Exhaust Gas Temperature Sensor harness is open or shorted– Exhaust Gas Temperature Sensor circuit poor electrical connection– Hydro-Carbon Absorber and Catalyst (HCAC) valve stuck or actuator problem Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1083 LEXUS OBD Code Description HCAC (Hydro-Carbon Absorber and…