P1101 VOLKSWAGEN HO2S11 Sensor Circuit Voltage Too Low Air Leak

Possible causes

– Faulty HO2S11 Sensor
– Exhaust leak near HO2S11 Sensor
– HO2S11 Sensor harness is open or shorted
– HO2S11 Sensor circuit poor electrical connection

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)