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Home › Chevrolet › 2006 › Impala SS › Repair and Diagnosis › Engine Performance › System › Engine Control System - 5.3L - DTC P0136 To DTC P0446 › DTC P0138 › Conditions for Setting the DTC › Rich Test

Rich Test

The ECM detects that the affected HO2S voltage parameter is more than 950 mV for 200 seconds.

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