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Home >> Toyota >> 2022 >> Corolla Cross L, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 109 (Engine Control System (M20A-FKS) - Diagnostic Codes (3 Of 6)) >> SFI SYSTEM (for K121) >> DTC P0420-00: Catalyst System Efficiency Below Threshold Bank 1 [11/2023 - ] >> Catalyst Location

Catalyst Location

WARNING: This page is about a different car, the 2025 Toyota Corolla Cross and 2024 Toyota Corolla Cross. However, it is still accessible from the selected car via links, so may be relevant.
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*A for 2WD *B for AWD
*1 Air Fuel Ratio Sensor (Sensor 1) *2 Air Fuel Ratio 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 (sensor 1) (*1) and the air fuel ratio sensor (sensor 2) (*2).