P1103 HO2S Heating Circuit Bank 1 Sensor 1 Voltage Too Low

Possible causes

– Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
– HO2S Bank 1 Sensor 1 blown fuse
– HO2S Bank 1 Sensor 1 harness is open or shorted
– HO2S Bank 1 Sensor 1 circuit poor electrical connection

Symptoms

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