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ELECTRICALS 215 Sr. No. Displayed DTC Code DTC Description Fault cause Probable trouble Area 77 P0138 - 12 Downstream oxygen sensor circuit short to battery Circuit short to battery 1) Loose/ damaged connections or intermittent fault. 2) Sensor supply line short circuit to battery/ ground. 3) Sensor signal line short circuit to battery/ ground. 4) Check the continuity from sensor connector pins to the ECU pins. 5) Check for back out of pins at both sensor connector and ECU connector. 6) Check for damage of pins at both sensor connector and ECU connector. 7) Faulty downstream HO2S2 sensor. 8) Faulty ECU. 78 P0137 - 11 Downstream oxygen sensor short circuit to ground Circuit short to ground 1) Loose/ damaged connections or intermittent fault. 2) Sensor supply line short circuit to battery/ ground. 3) Sensor signal line short circuit to battery/ ground. 4) Check the continuity from sensor connector pins to the ECU pins. 5) Check for back out of pins at both sensor connector and ECU connector. 6) Check for damage of pins at both sensor connector and ECU connector. 7) Faulty downstream HO2S2 sensor. 8) Faulty ECU. 79 P0140 - 64 Downstream oxygen sensor circuit signal non plausible Signal plausibility failure 1) Loose/ damaged connections or intermittent fault. 2) Sensor supply line short circuit to battery/ ground. 3) Sensor signal line short circuit to battery/ ground. 4) Check the continuity from sensor connector pins to the ECU pins. 5) Check for back out of pins at both sensor connector and ECU connector. 6) Check for damage of pins at both sensor connector and ECU connector. 7) Faulty downstream HO2S2 sensor. 8) Faulty ECU.