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Home >> Lexus >> 2011 >> RX 450h 3.5 B >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0300-P1423) >> 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)
P0016, P0018 (VVT system bank 1, 2 - misalignment)
P0031, P0032, P0051, P0052, P101D, P103D (Air fuel ratio sensor heater)
P0037, P0038, P0057, P0058, P102D, P105D (Heated oxygen sensor heater)
P0102, P0103 (Mass air flow meter)
P0107, P0108 (Manifold absolute pressure)
P0115, P0117, P0118 (Engine coolant temperature sensor)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor)
P0125 (Insufficient coolant temperature for closed loop fuel control)
P0136, P0137, P0138, P0139 (Heated oxygen sensor bank 1)
P014C, P014D, P014E, P014F (Air fuel ratio sensor - slow response)
P0156, P0157, P0158, P0159 (Heated oxygen sensor bank 2)
P015A, P015B, P015C, P015D (Air fuel ratio sensor - delayed response)
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)
P0401 (EGR system)
P0607 (Heated oxygen sensor - sensor 2)
P2195, P2196, P2197, P2198 (Air fuel ratio sensor - rationality)
P219A, P219B (Air fuel ratio sensor - imbalance)
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 3200 RPM
Air fuel ratio sensor Activated
Fuel system status Closed loop
Engine load 10 to 70%
All of the following conditions (a), (b) and (c) are met -
(a) Mass air flow 3 to 63 g/sec.
(b) Front catalyst temperature (estimated) 530 to 770°C (986 to 1418°F)
(c) Rear catalyst temperature (estimated) 400 to 675°C (752 to 1247°F)