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Home >> Chevrolet >> 2006 >> Impala LTZ >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 3.9L - DTC P0010 To DTC P0420 >> DTC P0420 >> Conditions for Setting the DTC
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Conditions for Setting the DTC

The ECM determines that the efficiency of the catalyst has degraded below a calibrated threshold. This diagnostic may conclude.

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