Possible causes – Faulty Air/Fuel Ratio Sensor Bank 1 Sensor 1– Air/Fuel Ratio Sensor Bank 1 Sensor 1 harness is open or shorted– Air/Fuel Ratio Sensor Bank 1 Sensor 1 circuit poor electrical conection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1133 LEXUS OBD Code Description The Air-Fuel ratio (A/F) sensor…