Possible causes – Faulty Heated Oxygen Sensor Bank 1 Sensor 1– Heated Oxygen Sensor Bank 1 Sensor 1 harness is open or shorted– Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– High Fuel Consumption– Excessive Smoke from Exhaust P2237 HYUNDAI OBD…