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Home >> Lexus >> 2017 >> RX 450h Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes) (5 Of 8) >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1); DTC P0430: Catalyst System Efficiency Below Threshold (Bank 2) [10/2015 - 07/2020] >> Catalyst Location
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Catalyst Location

Fig 1: Exploded View Of Exhaust Components
GTY651214Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
*1 Air Fuel Ratio Sensor (Bank 2 Sensor 1) *2 Exhaust Manifold Assembly LH (TWC: Front Catalyst)
*3 Front Exhaust Pipe Assembly *4 Heated Oxygen Sensor (Bank 2 Sensor 2)
*5 Air Fuel Ratio Sensor (Bank 1 Sensor 1) *6 Exhaust Manifold (TWC: Front Catalyst)
*7 No. 3 Front Exhaust Pipe Sub-assembly *8 Heated Oxygen Sensor (Bank 1 Sensor 2)
*9 Center Exhaust Pipe Assembly (TWC: Rear Catalyst) *10 Tail Exhaust Pipe Assembly
NOTE:
  • If DTC P0420 is output, replace the exhaust manifold (*6) and the center exhaust pipe assembly (*9) together when catalyst replacement is necessary (Excluding air fuel ratio sensor*5).
  • If DTC P0430 is output, replace the exhaust manifold assembly LH (*2) and the center exhaust pipe assembly (*9) together when catalyst replacement is necessary (Excluding air fuel ratio sensor*1).