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DTC Detecting Condition and Trouble Area

WARNING: This page is about a different car, the 2010 Suzuki Kizashi. However, it is still accessible from the selected car via links, so may be relevant.
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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