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Home >> Lexus >> 2023 >> LC 500 2D Convertible >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (Convertible) (4 Of 7) >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1); DTC P0430: Catalyst System Efficiency Below Threshold (Bank 2) [07/2020 - 05/2023] >> Catalyst Location
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Catalyst Location

GTY779796Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
*1 Air Fuel Ratio Sensor (Bank 1 Sensor 1) *2 Air Fuel Ratio Sensor (Bank 2 Sensor 1)
*3 Heated Oxygen Sensor (Bank 1 Sensor 2) *4 Heated Oxygen Sensor (Bank 2 Sensor 2)
*5 Exhaust Manifold Sub-assembly RH (TWC: Front Catalyst) *6 Exhaust Manifold Sub-assembly LH (TWC: Front Catalyst)
*7 Front Exhaust Pipe Assembly (TWC: Rear Catalyst) *8 Tail Exhaust Pipe Assembly
NOTE:
  • If DTC P0420 is output, replace the exhaust manifold sub-assembly LH (*6) and the front exhaust pipe assembly (*7) together when catalyst replacement is necessary (Excluding air fuel ratio sensor*1 and heated oxygen sensor*3).
  • If DTC P0430 is output, replace the exhaust manifold sub-assembly RH (*5) and the front exhaust pipe assembly (*7) together when catalyst replacement is necessary (Excluding air fuel ratio sensor*2 and heated oxygen sensor*4).