Ford P1133 OBD-II Trouble Code Definition: P1133 HO2S Insufficient Switching Sensor 1 P1133 Ford OBD-II Trouble CodeDescription: Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1133 OBD Code Description HO2S Insufficient Switching Sensor 1 is one of the definitions for the P1133; however your vehicle’s manufacturer may have a different definition for the […]