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Home >> Lexus >> 2015 >> GS 350 Base, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (2 Of 4) >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1); DTC P0430: Catalyst System Efficiency Below Threshold (Bank 2) [09/2014 - 10/2015] >> Catalyst Location
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Catalyst Location

GTY675828Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
TEXT IN ILLUSTRATION

*A for 2WD *B for AWD
*1 Exhaust Manifold Sub-assembly RH
(TWC: Front Catalyst)
*2 Exhaust Manifold Sub-assembly LH
(TWC: Front Catalyst)
*3 Air Fuel Ratio Sensor
(Bank 1 Sensor 1)
*4 Air Fuel Ratio Sensor
(Bank 2 Sensor 1)
*5 Heated Oxygen Sensor
(Bank 1 Sensor 2)
*6 Heated Oxygen Sensor
(Bank 2 Sensor 2)
*7 Front Exhaust Pipe Assembly
(TWC: Rear Catalyst)
*8 Tailpipe RH
*9 Tailpipe LH - -
NOTE:
  • When DTC P0420 is output, replace the exhaust manifold sub-assembly RH (*1) and the front exhaust pipe assembly (*7) together when catalyst replacement is necessary. (Excluding air fuel ratio sensor *3 and heated oxygen sensor *5)
  • When DTC P0430 is output, replace the exhaust manifold sub-assembly LH (*2) and the front exhaust pipe assembly (*7) together when catalyst replacement is necessary. (Excluding air fuel ratio sensor *4 and heated oxygen sensor *6)