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Home >> Lexus >> 2013 >> IS 350C Base >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System (Diagnostic Codes (P0171-P060A)) >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1); DTC P0430: Catalyst System Efficiency Below Threshold (Bank 2) >> Catalyst Location
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Catalyst Location

Fig 1: Exhaust System & Catalyst Location
GTY419775Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
TEXT IN ILLUSTRATION

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