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2015
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Regal GS, AWD
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Repair and Diagnosis
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Engine Performance
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Testing & Diagnosis
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Engine Controls And Fuel - 2.0L (LTG) - DTC P0335 To DTC P2635 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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Conditions for Setting the DTC
Conditions for Setting the DTC
The ECM determines that the efficiency of the catalyst has degraded below a calibrated threshold.