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2018
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Acadia Denali, FWD
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Repair and Diagnosis
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Different variant/trim
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Section 8 (Engine Controls And Fuel - 2.5L (LCV) - Diagnostic Information And Procedures (P0351 - P2635))
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Diagnostic Information And Procedures
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DTC P0420: Catalyst System Low Efficiency
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Action Taken When the DTC Sets
Action Taken When the DTC Sets
WARNING:
This page is about a different variant/trim than selected.
DTC P0420 is a Type A DTC.