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Home >> Lexus >> 2013 >> CT 200h F Sport >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0300-P0657)) >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) >> Typical Enabling Conditions
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Typical Enabling Conditions

Monitor runs whenever following DTCs not present P0010 (Camshaft timing oil control valve assembly)
P0011 (VVT system - Advance)
P0012 (VVT system - Retard)
P0016 (VVT system - Misalignment)
P0031, P0032, P101D (Air fuel ratio sensor heater - Sensor 1)
P0037, P0038, P102D (Heated oxygen sensor heater - Sensor 2)
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, P0607 (Rear oxygen sensor - Sensor 2)
P014C, P014D (Air fuel ratio sensor - Slow response)
P015A, P015B (Air fuel ratio sensor - Delayed response)
P0171, P0172 (Fuel system)
P0301, P0302, P0303, P0304 (Misfire)
P0335 (Crankshaft position sensor)
P0340, P0342, P0343 (Camshaft position sensor)
P0351, P0352, P0353, P0354 (Igniter)
P0401 (EGR system (Closed))
P2195, P2196 (Air fuel ratio sensor - Rationality)
P219A (Air fuel ratio sensor - Imbalance)
P2237 (Air fuel ratio sensor - Open)
P2238, P2252 (Air fuel ratio sensor - Low impedance)
P2239, P2253 (Air fuel ratio sensor - High impedance)
Auxiliary battery voltage 11 V or more
Intake air temperature -10°C (14°F) or higher
Engine coolant temperature 75°C (167°F) or higher
Atmospheric pressure 76 kPa(abs)[570 mmHg(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 more, and less than 70%
All of the following conditions (a), (b) and (c) are met -
(a) Mass air flow rate 2.5 to 50 gm/sec
(b) Front catalyst temperature (estimated) 520°C (968°F) or higher, and below 770°C (1418°F)
(c) Rear catalyst temperature (estimated) 450°C (842°F) or higher, and below 700°C (1292°F)