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Home >> Subaru >> 2017 >> BRZ Limited, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 3) >> EFI system (FA20) >> DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1) >> Monitor strategy >> Notes
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Monitor strategy: Notes

Related DTCs P0420: Catalyst monitor with sufficient sensor performance for other monitors functional check
Required Sensors/Components (Main) Air/fuel ratio and oxygen sensors
Required Sensors/Components (Related) Intake air temperature sensor, intake air flow meter SUB-ASSY, vacuum sensor, crankshaft position sensor, and E.F.I. water temperature sensor
Frequency of Operation Once per driving cycle
Duration Less than 1 second
MIL Operation 2 operation cycle
Sequence of Operation None
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