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Home >> Subaru >> 2016 >> WRX Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC) (WRX) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0420 Catalyst System Efficiency Below Threshold Bank 1 >> Execution Condition

Execution Condition

Secondary Parameters Execution condition
Battery voltage ≥ 10.9 V
Barometric pressure ≥ 75 kPa (563 mmHg, 22.2 inHg)
Estimated catalyst temperature = 480°C (896°F)
Sub feedback In operation
ELCM switching valve = Open
Vehicle speed ≥ 40 km/h (24.9 MPH)
Amount of intake air ≥ 5 g/s (0.18 oz/s)
and
< 45 g/s (1.59 oz/s)
Rear oxygen output change from 550 mV or less to 550 mV or more Experienced after fuel cut
Estimated temperature of the rear oxygen sensor element ≥ 450°C (842°F)