Lexus ES300 - P0420 DTC - Catalyst System Efficiency Below Threshold Bank 1

CEL, TRAC OFF dash lights, car drives fine/like normal
October 2016 - Bank 1 Sensor 1 Air/Fuel Ratio Sensor Replacement
[DENSO 234-9021 Air/Fuel Ratio Sensor]
November 2016 - Lexus ES300 Catalytic Converter Replacement
[MagnaFlow Direct-Fit Catalytic Converters 444019]
February 2019 - Bank 1 Sensor 2 Oxygen Sensor Replacement
[DENSO 234-4137 Oxygen Sensor]
CAT is bad already ? Any ideas ? What to do ?
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Adam

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