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Home >> Subaru >> 2020 >> Ascent Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 4) >> 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
Barometric pressure
Amount of intake air
Accelerator pedal position
Rear oxygen sensor output voltage after
fuel cut
Estimated catalyst temperature
Estimated temperature of the rear oxygen sensor element
10.9 V or more
75.06 kPa (563 mmHg, 22.2 inHg) or more
Less than 8.5 g/s (0.3 oz/s)
While idling
0.15 V or less
460°C (860°F) or more
450°C (842°F) or more
(Integrated intake air amount during fuel cut
Fuel shut-off function thereafter)
A/F element impedance
More than 19.3 g/s (0.7 oz/s)
Other than not in operation
206 ft or less