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Home >> Toyota >> 2017 >> Prius Prime Advanced >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (4 Of 7) >> SFI System >> DTC P0420-00: Catalyst System Efficiency Below Threshold Bank 1 [09/2016 - 01/2018] >> Typical Enabling Conditions
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Typical Enabling Conditions

Monitor runs whenever the following DTCs are not stored P0010 (Camshaft timing oil control valve)
P0011 (VVT system - advance)
P0012 (VVT system - retard)
P0016 (VVT system - misalignment)
P0031, P0032, P101D (Air fuel ratio sensor heater)
P0037, P0038, P0141, P102D (Heated oxygen sensor heater)
P0101, P0102, P0103 (Mass air flow meter)
P0106, P0107, P0108 (Manifold absolute pressure)
P0111, P0112, P0113 (Intake air temperature sensor)
P0116, P0117, P0118 (Engine coolant temperature sensor)
P011B (Engine coolant temperature/intake air temperature sensor correlation)
P0121, P0122, P0123, P0222, P0223, P2135 (Throttle position sensor)
P0125 (Insufficient coolant temperature for closed loop fuel control)
P0128 (Thermostat)
P0136, P0137, P0138, P0139, P013A, P0607 (Heated oxygen sensor)
P014C, P014D, P015A, P015B, P2195, P2196, P2237, P2238, P2239, P2252, P2253 (Air fuel ratio sensor)
P0171, P0172 (Fuel system)
P0300 - P0304 (Misfire)
P0327, P0328 (Knock control sensor)
P0335 (Crankshaft position sensor)
P0340, P0342, P0343 (Camshaft position sensor)
P0351 - P0354 (Igniter)
P0401, P0403 (EGR system)
P0657, P2102, P2103, P2111, P2112, P2119 (Throttle actuator)
P219A, P219C, P219D, P219E, P219F (Air-fuel ratio imbalance)
P2228, P2229 (Atmospheric pressure sensor)
Response rate during fuel cut from rich condition Completed
Auxiliary 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 (abs) [11 psi (abs)] or higher
Idling Off
Engine speed Less than 4500 rpm
Air fuel ratio sensor status Activated
Fuel system status Closed loop
Engine load 10% or higher, and less than 80%
All of the following conditions are met 1, 2 and 3
1. Mass air flow 2.5 gm/sec or more, and less than 50 gm/sec
2. Front catalyst temperature (estimated) 450°C (842°F) or higher, and less than 770°C (1418°F)
3. Rear catalyst temperature (estimated) 330°C (626°F) or higher, and less than 700°C (1292°F)
Air fuel ratio imbalance of clogged EGR runner fail Not set