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Home >> Subaru >> 2016 >> WRX Premium, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Diagnostic Trouble Code (DTC) Detecting Criteria) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0420 Catalyst System Efficiency Below Threshold Bank 1 >> Execution Condition

Execution Condition

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Secondary Parameters Execution condition
Battery voltage ≥ 10.9 V
Barometric pressure ≥ 75.1 kPa (563 mmHg, 22.2 inHg)
Sub feedback In operation
Intake air amount ≥ 10 g/s (0.35 oz/s)
  and
  < 50 g/s (1.76 oz/s)
Estimated catalyst temperature = 450 °C (842 °F)
Vehicle speed ≥ 40 km/h (24.9 MPH)
Rear oxygen output change from 0.55 V or less to 0.55 V or more Experienced after fuel cut
ELCM switching valve = Open
Estimated temperature of the rear oxygen sensor element ≥ 500 °C (932 °F)