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Home >> Lexus >> 2021 >> LC 500h >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System - Diagnostic Codes (5 Of 9) >> SFI System >> DTC P0420-00: Catalyst System Efficiency Below Threshold Bank 1; DTC P0430-00: Catalyst System Efficiency Below Threshold Bank 2 [01/2017 - 04/2020] >> Typical Enabling Conditions
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Typical Enabling Conditions

Monitor runs whenever the following DTCs are not stored P0010, P0020 (VVT oil control solenoid)
P0011, P0021 (VVT system - advance)
P0012, P0022 (VVT system - retard)
P0013, P0023 (Exhaust VVT oil control solenoid)
P0014, P0024 (Exhaust VVT system - advance)
P0015, P0025 (Exhaust VVT system - retard)
P0016, P0018 (VVT system - misalignment)
P0017, P0019 (Exhaust VVT system - misalignment)
P0031, P0032, P0051, P0052, P101D, P103D (Air fuel ratio sensor (sensor 1) heater)
P0037, P0038, P0057, P0058, P102D, P105D (Air fuel ratio sensor (sensor 2) heater)
P0087, P0088, P0191, P0192, P0193 (Fuel pressure sensor (for high pressure side))
P00D5, P00D6, P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D, P2195, P2196, P2197, P2198, P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255, P2256 (Air fuel ratio sensor (sensor 1))
P0101, P0102, P0103 (Mass air flow meter)
P0106, P0107, P0108 (Manifold absolute pressure)
P0111, P0112, P0113 (Intake air temperature sensor)
P0116, P0117, P0118 (Engine coolant temperature sensor)
P0136, P013A, P013C, P0156, P2270, P2271, P2272, P2273, P22AB, P22AC, P22AD, P22B3, P22B4, P22B8, P22B9, P22BA, P22C0, P22C1 (Air fuel ratio sensor (sensor 2))
P011B (Engine coolant temperature/intake air temperature sensor correlation)
P0121, P0122, P0123, P0222, P0223, P2135 (Throttle position sensor)
P0125 (Insufficient coolant temperature for closed loop fuel control)
P0128 (Thermostat)
P0171, P0172, P0174, P0175 (Fuel system)
P0201, P0202, P0203, P0204, P0205, P0206, P062D, P21CF, P21D0, P21D1, P21D2, P21D3, P21D4 (Fuel injector)
P0300, P0301, P0302, P0303, P0304, P0305, P0306 (Misfire)
P0327, P0328, P0332, P0333 (Knock control sensor)
P0335, P0337, P0338 (Crankshaft position sensor)
P0340, P0342, P0343, P0345, P0347, P0348 (VVT sensor)
P0351, P0352, P0353, P0354, P0355, P0356 (Igniter)
P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT sensor)
P0401 (EGR system (closed))
P0403 (EGR control circuit)
P0657, P0658, P2102, P2103, P2111, P2112, P2119 (Throttle actuator)
P107B, P107C, P107D (Fuel pressure sensor (for low pressure side))
P11EA, P11EB, P11EC, P11ED, P11EE, P11EF, P11F0, P11F1, P219A, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1 (Air-fuel ratio imbalance)
P1235 (High pressure fuel pump circuit)
P2228, P2229 (Atmospheric pressure sensor)
Response rate during fuel cut from rich condition Completed
Auxiliary battery voltage 11 V or higher
Intake air temperature -10°C (14°F) or higher
Engine coolant temperature 75°C (167°F) or higher
Atmospheric pressure 76 kPa(abs) [11.02 psi(abs)] or higher
Idling Off
Engine speed Less than 4000 rpm
Air fuel ratio sensor status Activated
Fuel system status Closed loop
Engine load 10% or higher, and less than 90%
All of the following conditions are met 1, 2 and 3
1. Mass air flow 3 gm/sec or more, and less than 90 gm/sec
2. Front catalyst temperature (estimated) 500°C (932°F) or higher, and less than 800°C (1472°F)
3. Rear catalyst temperature (estimated) 475°C (887°F) or higher, and less than 700°C (1292°F)