Possible causes – Faulty HO2 Sensor Bank 1– HO2 Sensor Bank 1 harness is open or shorted– HO2 Sensor Bank 1 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) AUDI Related P1111 code 2002 AUDI A4 Engine And Engine Cooling:engine 2002 AUDI S4 Engine And Engine Cooling:engine 2002…