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Home >> Lexus >> 2024 >> LX 600 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (W/O Canister Pump Module) - Diagnostic Codes (3 Of 5) >> SFI SYSTEM (w/o Canister Pump Module) >> DTC P0420-00: Catalyst System Efficiency Below Threshold Bank 1; DTC P0430-00: Catalyst System Efficiency Below Threshold Bank 2 [12/2021 - ] >> Typical Enabling Conditions

Typical Enabling Conditions

Response rate during fuel cut from rich condition Completed
Battery voltage 11 V or higher
Intake air temperature (mass air flow meter sub-assembly) -10°C (14°F) or higher
Engine coolant temperature 75°C (167°F) or higher
Atmospheric pressure 76 kPa (abs) [11 psi (abs)] or higher
Idling Off
Engine speed Less than 3200 rpm
Sub feedback control Executing
Air fuel ratio sensor (sensor 1) status Activated
Fuel system status Closed loop
Engine load 10% or higher, and less than 140%
All of the following conditions are met 1, 2 and 3
1. Mass air flow 5 gm/sec or more, and less than 60 gm/sec
2. Front catalyst temperature (estimated) 540°C (1004°F) or higher, and less than 800°C (1472°F)
3. Rear catalyst temperature (estimated) 400°C (752°F) or higher, and less than 700°C (1292°F)