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Home >> Subaru >> 2012 >> Outback Base, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4SO) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1) >> Enable Condition
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Enable Condition

Secondary Parameters Enable Conditions
Battery voltage ≥ 10.9 V
Atmospheric pressure ≥ 75 kPa (563 mmHg, 22.2 inHg)
Engine coolant temperature ≥ 75 °C (167 °F) (PZEV model)
  ≥ 70 °C (158 °F) (AT model except for PZEV)
  ≥ 75 °C (167 °F) (MT model except for PZEV)
Estimated catalyst temperature ≥ 580 °C (1076 °F) (AT model)
  ≥ 600 °C (1112 °F) (MT model)
Misfire detection every 200 rotations < 5 time(s)
Learning value of evaporation gas density < 0.2
Sub feedback In operation
Evaporative system diagnosis Not in operation
Time of difference (< 0.10) between actual lambda and target lambda ≥ 1000 ms
Vehicle speed > 75 km/h (46.6 MPH)
Amount of intake air ≥ 5 g/s (0.18 oz/s) (PZEV AT model)
  ≥ 7 g/s (0.25 oz/s) (except for PZEV AT model) and
  < 40 g/s (1.41 oz/s)
Engine load change every 0.5 engine revs. < 0.02 g/rev (0 oz/rev)
Rear oxygen output change from 660 mV or less to 660 mV or more Experienced after fuel cut
Elapsed time after starting the engine ≥ 225 s (PZEV model)
  ≥ 218 s (except for PZEV model)
Purge execution calculated time ≥ 0 s