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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

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Rich Test

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

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