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Help with OBD P0158 & P0161 Codes Greeting. 2004 Liberty, 3.7 6 cylinder with 62,000 miles. New platinum plugs, oil change, pcv valve @ 60,000. Shortly after purchase of this vehicle at 60k and a solid pass at the smog station, the OBD started kicking up a P0158, which is a o2 sensor, bank...