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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (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

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Secondary Parameters Execution condition
Battery voltage ≥ 10.9 V
Barometric pressure ≥ 75.1kPa (563mmHg, 22.2inHg)
Amount of intake air < 7.5g/s (0.26oz/s)
Accelerator pedal position = 0%
Rear oxygen output voltage after fuel cut < 0.15V
Estimated catalyst temperature ≥ 480°C (896°F) (CVT model)
≥ 550°C (1022°F) (MT model)
Estimated temperature of the rear oxygen sensor element ≥ 500°C (932°F)
((Fuel system status = Fuel cut
Integrated amount of intake air mass during Fuel cut) ≥ 12.95g (0.46oz)
followed by Fuel system status) Fuel cut