Possible causes
– Faulty Heated Oxygen Sensor
– Heated Oxygen Sensor harness is open or shorted
– Heated Oxygen Sensor circuit poor electrical connection
– Heated Oxygen Sensor harness is open or shorted
– Heated Oxygen Sensor circuit poor electrical connection
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1031 MERCEDES-BENZ Description
Heated Oxygen Sensor (HO2S)