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Home >> Chevrolet >> 2008 >> Optra LT, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.8L (L79) >> Diagnostic Information and Procedures >> DTC P0137 or P0138 >> Circuit/System Verification
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Circuit/System Verification

  1. Engine running, observe the scan tool heated oxygen sensor (HO2S) 2 voltage parameter. The reading should fluctuate above and below the range of 350-550 mV.
  2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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