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Home › Chevrolet › 2004 › Optra Base, Standard › Repair and Diagnosis › Engine Performance › System › Engine Controls - 1.6L (L91) - DTC P0107 To DTC P0335 › DTC P0137 › Conditions for Setting the DTC › Closed Loop Test

Closed Loop Test

The ECM detects that the HO2S voltage is less than 70 mV.
The condition exists for more than 40 seconds.