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Home >> Lexus >> 2021 >> RX 350 Base, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System - Diagnostic Codes (5 Of 7) >> SFI System >> DTC P0420-00: Catalyst System Efficiency Below Threshold Bank 1; DTC P0430-00: Catalyst System Efficiency Below Threshold Bank 2 [09/2015 - 08/2019] >> Catalyst Location
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Catalyst Location

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*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 TWC: Front Catalyst *6 Exhaust Manifold
*7 Exhaust Manifold Assembly LH *8 Front Exhaust Pipe Assembly
*9 Front No. 3 Exhaust Pipe Assembly *10 Center Exhaust Pipe Assembly (TWC: Rear Catalyst)
*11 Tail Exhaust Pipe Assembly *12 No. 2 Tail Exhaust Pipe Assembly
NOTE:
  • If DTC P0420-00 is output, replace the exhaust manifold (*6) and the center exhaust pipe assembly (*10) together when catalyst replacement is necessary (Excluding air fuel ratio sensor*1 and heated oxygen sensor*3).
  • If DTC P0430-00 is output, replace the exhaust manifold assembly LH (*7) and the center exhaust pipe assembly (*10) together when catalyst replacement is necessary (Excluding air fuel ratio sensor*2 and heated oxygen sensor*4).