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Home >> Lexus >> 2025 >> NX 250 FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 65 (Engine Control System - Diagnostic Codes (P0340-P043E)) >> SFI System >> DTC P0420-00: Catalyst System Efficiency Below Threshold Bank 1 [03/2023 - ] >> Typical Malfunction Thresholds

Typical Malfunction Thresholds

WARNING: This page is about a different car, the 2025 Lexus NX 350h, 2024 Lexus NX 350h, 2023 Lexus NX 350h, and 2022 Lexus NX 350h. However, it is still accessible from the selected car via links, so may be relevant.
EXCEPT MEXICO MODELS

Oxygen Storage Capacity (OSC) of catalyst (Normalized) Less than 1
FOR MEXICO MODELS

Oxygen Storage Capacity (OSC) of catalyst (Normalized) Less than 0.0481