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Home >> Toyota >> 2024 >> Corolla LE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 39 (Engine Control System (2ZR-FXE) - Diagnostic Codes (10 Of 15)) >> SFI System >> DTC P0420-00: Catalyst System Efficiency Below Threshold Bank 1 [09/2024 - ] >> Catalyst Location

Catalyst Location

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*1 Air Fuel Ratio Sensor (Sensor 1) *2 Heated Oxygen Sensor (Sensor 2)
*3 Exhaust Manifold *4 Front Exhaust Pipe Assembly
*5 Tail Exhaust Pipe Assembly *6 TWC: Front Catalyst
*7 TWC: Rear Catalyst - -
NOTE:

When replacing the exhaust manifold (*3) and the front exhaust pipe assembly (*4) in order to replace the three-way catalytic converter, it is not necessary to replace the air fuel ratio sensor (*1) and the heated oxygen sensor (*2).