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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P0016 - P049D)) >> Diagnostic Information And Procedures >> DTC P0421: Catalyst 1 Low Efficiency >> Conditions for Setting the DTC

Conditions for Setting the DTC

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The ECM determines that the efficiency of the diesel oxidation catalyst has degraded below a calibrated threshold.

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