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Home >> Subaru >> 2015 >> WRX Limited, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC) (STI)) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1) >> Enable Conditions

Enable Conditions

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ENABLE CONDITIONS

Secondary Parameters Enable Conditions
Battery voltage ≥ 10.9 V
Atmospheric pressure ≥ 75.1 kPa (563 mmHg, 22.2 inHg)
Main feedback In operation
Sub feedback In operation
Amount of intake air ≥ 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
Second diagnosis of P0441 Not in operation
Estimated temperature of the rear oxygen sensor element ≥ 500 °C (932 °F)