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DTC Detecting Condition and Trouble Area

DTC DETECTING CONDITION CHART

DTC detecting condition Trouble area
P0137: O2 Sensor Circuit Low Voltage (Sensor 2) 
Output voltage of HO2S signal circuit is lower than 0.02 V for 25 sec.
(2 D/C detection logic)
  • HO2S and/or its circuit
  • Exhaust system
  • Air intake system
  • ECM
P0138: O2 Sensor Circuit High Voltage (Sensor 2) 
Output voltage of HO2S signal circuit is higher than 1.2 V for 5 sec. even if HO2S heater is turned ON for 200 sec.
(2 D/C detection logic)
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