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Home >> GMC >> 2009 >> Envoy 4.2 S, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.2L - DTC P0366 T0 DTC P2544 >> DTC P0420 >> DTC Descriptor

July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

DTC Descriptor

DTC P0420: Catalyst System Low Efficiency Bank 1

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