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Home >> Subaru >> 2016 >> Legacy 2.5i >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls (H4DO) (Diagnostics) (2 Of 4) >> DTC P0420 Catalyst System Efficiency Below Threshold Bank 1 >> DTC Detecting Condition

DTC P0420 Catalyst System Efficiency Below Threshold Bank 1: DTC Detecting Condition

Detected when two consecutive driving cycles with fault occur.

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