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Home >> Chevrolet >> 2011 >> Impala LS, 3.9 M >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 22 (Engine Controls And Fuel - 3.5L - DTC P0341 Through DTC P2544) >> DTC P0420 >> Conditions for Setting the DTC

Conditions for Setting the DTC

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

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