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Home › Chevrolet › 2007 › Optra LS, Standard › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 1.8L (L79) › Diagnostic Information and Procedures › DTC P1121 or P1122 › Circuit/System Verification

Circuit/System Verification

  1. Verify that DTCs P0122 or P0123 are not set.
  2. Operate the vehicle within the conditions for running the DTC. DTC P1121 or P1122 should not set.
  3. 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 Freeze Frame/Failure Records Data List.
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