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DTC P0139, P0159 HO2S2 EC-299 C D E F G H I J K L M A EC 2007 Pathfinder 3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 2 harness connector. 3. Disconnect ECM harness connector. 4. Check harness continuity between HO2S2 terminal 4 and ECM terminal 78. 5. Also check harness for short to ground and short to power. OK or NG OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors. Continuity should exist. BBIA0540E |