Ford P1100 OBD-II Trouble Code Definition: P1100 HO2S12 Sensor Circuit Voltage Too Low Air Leak P1100 Ford OBD-II Trouble CodeDescription: Causes – Faulty HO2S12 Sensor– Exhaust leak near HO2S12 Sensor– HO2S12 Sensor harness is open or shorted– HO2S12 Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) […]