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Home >> Subaru >> 2017 >> Outback 2.5i >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (P0171 To P0685) (H4DO) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0420: Catalyst System Efficiency Below Threshold Bank 1 >> Execution Condition

Execution Condition

Except for PZEV model

Secondary parameters Execution condition
Battery voltage ≥ 10.9 V
Barometric pressure ≥ 75.1 kPa (563 mmHg, 22.2 inHg)
Amount of intake air ≥ 8 g/s (0.28 oz/s)
and
< 45 g/s (1.59 oz/s)
Estimated catalyst temperature ≥ 575 °C (1067 °F) (AT model)
≥ 575 °C (1067 °F) (MT model)
Vehicle speed ≥ 40 km/h (24.9 MPH)
Estimated temperature of the rear oxygen sensor element ≥ 500 °C (932 °F)
Sub feedback In operation
Experiences the following conditions after experiencing all of the above conditions  
Rear oxygen output voltage after fuel cut ≥ 0.55 V

PZEV model

Secondary parameters Execution condition
Battery voltage ≥ 10.9 V
Barometric pressure ≥ 75.1 kPa (563 mmHg, 22.2 inHg)
Amount of intake air < 7.5 g/s (0.26 oz/s)
Accelerator pedal position
Rear oxygen output voltage after fuel cut
< 0.15 V
Estimated catalyst temperature ≥ 550 °C (1022 °F)
Estimated temperature of the rear oxygen sensor element ≥ 500 °C (932 °F)
((Fuel shut-off function In operation
Integrated intake air amount during fuel cut) ≥ 12.95 g (0.46 oz) ((1))
Fuel shut-off function from above) Not in operation
(1) 5 seconds or more of fuel cut