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Home >> Lexus >> 2011 >> IS 250C Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0190-U062F)) >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1); DTC P0430: Catalyst System Efficiency Below Threshold (Bank 2) >> Typical Enabling Conditions
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Typical Enabling Conditions

Monitor runs whenever following DTCs are not present P0010, P0020 (Camshaft timing oil control valve assembly bank 1, 2)
P0011, P0021 (VVT system bank 1, 2 - advance)
P0012, P0022 (VVT system bank 1, 2 - retard)
P0013, P0023 (Exhaust camshaft timing oil control valve assembly bank 1, 2)
P0014, P0024 (Exhaust VVT system bank 1, 2 - advance)
P0015, P0025 (Exhaust VVT system bank 1, 2 - retard)
P0016, P0018 (VVT system bank 1, 2 - misalignment)
P0017, P0019 (Exhaust VVT system bank 1, 2 - misalignment)
P0031, P0032, P0051, P0052 (Air fuel ratio sensor heater)
P0037, P0038, P0057, P0058 (Heated oxygen sensor heater)
P0102, P0103 (Mass air flow meter)
P0115, P0117, P0118 (Engine coolant temperature sensor)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor)
P0125 (Insufficient engine coolant temperature for closed loop)
P0136, P0137, P0138, P0139 (Heated oxygen sensor bank 1)
P014C, P014D, P014E, P014F (Air fuel ratio sensor - slow response)
P015A, P015B, P015C, P015D (Air fuel ratio sensor - delayed response)
P0156, P0157, P0158, P0159 (Heated oxygen sensor bank 2)
P0171, P0172, P0174, P0175 (Fuel system)
P0301, P0302, P0303, P0304, P0305, P0306 (Misfire)
P0335 (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)
P0500 (Vehicle speed sensor)
P0607 (Heated oxygen sensor - sensor 2)
P2195, P2196, P2197, P2198 (Air fuel ratio sensor - rationality)
P2237, P2240 (Air fuel ratio sensor - open)
P2238, P2241, P2252, P2255 (Air fuel ratio sensor - low impedance)
P2239, P2242, P2253, P2256 (Air fuel ratio sensor - high impedance)
Battery voltage 11 V or more
Intake air temperature -10°C (14°F) or more
Engine coolant temperature 75°C (167°F) or more
Atmospheric pressure 76 kPa (570 mmHg) or more
Idle OFF
Engine speed Less than 4000 rpm
Air fuel ratio sensor Activated
Fuel system status Closed loop
Engine load 10 to 75%
All of the following conditions are met: Conditions 1, 2 and 3
1. Mass air flow rate 5 to 45 g/sec.
2. Front catalyst temperature (estimated) 600 to 840°C (1112 to 1544°F)
3. Rear catalyst temperature (estimated) 600 to 840°C (1112 to 1544°F)
Shift position 4th or higher