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Home >> Lexus >> 2012 >> IS 350 Base, RWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0171-P0607)) >> 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 (OCV bank 1, 2)
P0011, P0021 (VVT system bank 1, 2 - advance)
P0012, P0022 (VVT system bank 1, 2 - retard)
P0013, P0023 (Exhaust OCV 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 (A/F sensor heater)
P0037, P0038, P0057, P0058 (HO2 sensor heater)
P0102, P0103 (MAF meter)
P0115, P0117, P0118 (ECT sensor)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for closed loop)
P0136, P0137, P0138, P0139 (HO2 sensor bank 1)
P014C, P014D, P014E, P014F (Air fuel ratio sensor - slow response)
P0156, P0157, P0158, P0159 (HO2 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 (CKP 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 (HO2 sensor - sensor 2)
P2195, P2196, P2197, P2198 (A/F sensor - rationality)
P2237, P2240 (A/F sensor - open)
P2238, P2241, P2252, P2255 (A/F sensor - low impedance)
P2239, P2242, P2253, P2256 (A/F sensor - high impedance)
Battery voltage 11 V or more
IAT -10°C (14°F) or more
ECT 75°C (167°F) or more
Atmospheric pressure 76 kPa(abs) [570 mmHg(abs)] or more
Idle Off
Engine speed Less than 3200 rpm
A/F sensor status Activated
Fuel system status Closed loop
Engine load 10% or more, and less than 70% (for 2WD)
10% or more, and less than 75% (for AWD)
All of the following conditions are met: Condition 1, 2 and 3
1. MAF 2.9 g/sec or more, and less than 74 g/sec (for 2WD)
5 g/sec or more, and less than 45 g/sec (for AWD)
2. Front catalyst temperature (estimated) 600°C (1112°F) or more, and less than 820°C (1508°F) (for 2WD)
620°C (1148°F) or more, and less than 800°C (1472°F) (for AWD)
3. Rear catalyst temperature (estimated) 300°C (572°F) or more, and less than 830°C (1526°F) (for 2WD)
620°C (1148°F) or more, and less than 800°C (1472°F) (for AWD)
Shift position 3rd or more (for 2WD)
4th or more (for AWD)
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