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Home >> Lexus >> 2019 >> GX 460 Luxury >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes) (3 Of 7) >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1); DTC P0430: Catalyst System Efficiency Below Threshold (Bank 2) [08/2015 - 08/2022] >> Typical Enabling Conditions
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Typical Enabling Conditions

Monitor runs whenever following DTCs not present P0010, P0020 (VVT oil control valve)
P0011, P0021 (VVT system - Advance)
P0012, P0022 (VVT system - Retard)
P0013, P0023 (Exhaust VVT oil control valve)
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 heater)
P0037, P0038, P0057, P0058, P102D, P105D (Rear oxygen sensor heater)
P006A, P0107, P0108 (Manifold absolute pressure)
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 coolant temperature for closed loop fuel control)
P0136, P0137, P0138, P0139, P013A, P013C, P0156, P0157, P0158, P0159, P0607 (Rear oxygen sensor)
P0171, P0172, P0174, P0175 (Fuel system)
P0300 - P0308 (Misfire)
P0335 (Crankshaft position sensor)
P0340, P0342, P0343, P0345, P0347, P0348 (VVT sensor)
P0351 - P0358 (Igniter)
P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT sensor)
P0401 (EGR system)
P0412, P0418, P1613 (Secondary air injection system control)
P0416, P0417, P2440, P2441, P2442, P2443, P2444, P2445 (Secondary air injection system)
P0500 (Vehicle speed sensor)
P1340 (Camshaft position sensor)
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)
P219A, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2, P21A3 (Air-fuel ratio imbalance)
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 (570 mmHg) or higher
Idling OFF
Engine speed Less than 3200 rpm
Air fuel ratio sensor status Activated
Fuel system status Closed loop
Engine load 10 to 75%
All of following conditions (a), (b) and (c) met -
(a) Mass air flow 7.5 to 75 g/sec.
(b) Estimated front catalyst temperature 580 to 820°C (1076 to 1508°F)
(c) Estimated rear catalyst temperature 350 to 700°C (662 to 1292°F)
Shift position 4th or higher

HINT: 

The estimated catalyst temperature can be read through the Data List using the Techstream.