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Spark LT, Automatic CVT Trans
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Repair and Diagnosis
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Different car
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Section 35 (Engine Controls And Fuel - 1.4L (LV7) - DTC P0351 To DTC P2544 And Diagnostic Information And Procedures)
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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 car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0420 is a Type A DTC.