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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 35 (Engine Controls And Fuel - 1.4L (LV7) - DTC P0351 To DTC P2544 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0420: Catalyst System Low Efficiency >> Conditions for Setting the DTC

Conditions for Setting the DTC

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The ECM has detected that the catalyst efficiency has degraded below a calibrated threshold.

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