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Home >> Chevrolet >> 2006 >> Epica LTZ >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 2.0L (L34 GMDAT) - DTC P0137 To DTC P1171 >> DTC P0137 or P0138 >> Circuit/System Verification

Circuit/System Verification

  1. Engine running, observe the HO2S voltage parameter. The reading should fluctuate above and below the range of 350-550 mV.
  2. If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the FreezeFrame/Failure Records List.
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