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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System (Diagnostics) (P0171 To P0685) (H4DOTC) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0420 Catalyst System Efficiency Below Threshold Bank 1 >> Execution Condition

Execution Condition

Secondary Parameters Execution condition
Battery voltage ≥ 10.9 V
Barometric pressure ≥ 75.1 kPa (563 mmHg, 22.2 inHG)
Amount of intake air ≥ 5 g/s (0.18 oz/s)
and
< 45 g/s (1.59 oz/s)
Estimated catalyst temperature ≥ 480°C (896°F)
Vehicle speed ≥ 40 km/h (24.9 MPH)
Estimated temperature of the rear oxygen sensor element ≥ 450°C (842°F)
Sub feedback In operation
Rear oxygen sensor output voltage after fuel cut ≥ 0.55 V