P1031 BUICK HO2S Heater Current Monitor Control Circuit Banks 1 and 2 Sensor 1

Possible causes

– Faulty Heated Oxygen Sensor Bank 1 or 2
– Heated Oxygen Sensor Bank 1 or 2 harness is open or shorted
– Heated Oxygen Sensor Bank 1 or 2 circuit poor electrical connection

Symptoms

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

P1031 BUICK OBD Code Description

Heated Oxygen Sensor (HO2S)