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Home >> Subaru >> 2020 >> Crosstrek Base, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Engine Control System (Diagnostics) (HEV) (2 Of 4)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0420: Catalyst System Efficiency Below Threshold Bank 1 >> General Description >> Execution Condition

Execution Condition

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Secondary parameters Execution condition
Battery voltage 10.9 V or more
Barometric pressure 75.1 kPa (563 mmHg, 22.2 inHg) or more
Amount of intake air Less than 6.5 g/s (0.23 oz/s)
Control request from HEV system to engine No
Rear oxygen output voltage after fuel cut 0.15V or less
Estimated catalyst temperature 500°C (932°F) or more
Rear oxygen sensor element impedance 185 ft or less
(Integrated intake air amount during fuel cut More than 18g (0.63 oz)
Fuel shut-off function thereafter) Not in operation
A/F element impedance 75 ft or less