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Home >> Audi >> 2015 >> A4 Prestige >> Repair and Diagnosis >> External Pages >> Different car >> Section 380 (Engine Control System (Diagnostic Codes (P0300-P148F))) >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) [08/2013 - ] >> Monitor Strategy

Monitor Strategy

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
Related DTCs P0420: Catalyst deterioration
Required Sensors/Components (Main) Air fuel ratio sensor
Heated oxygen sensor
Required Sensors/Components (Related) Intake air temperature sensor
Mass air flow meter sub-assembly
Crankshaft position sensor
Engine coolant temperature sensor
Frequency of Operation Once per driving cycle
Duration Approximately 30 seconds
MIL Operation Immediate
Sequence of Operation None