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Home >> Subaru >> 2015 >> BRZ Series.Blue, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnostics (2 Of 3) >> DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1) >> Typical Enabling Conditions
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Typical Enabling Conditions

Overlap prohibited DTC P0030, P0031, P0032 (air/fuel ratio sensor - heater)
P0037, P0038 (oxygen sensor - heater)
P0068, P0107, P0108 (Vacuum (MAP) sensor)
P0101, P0102, P0103 (intake air flow (MAF) meter)
P0111, P0112, P0113 (Intake Air Temperature (IAT) sensor)
P0117, P0118, P0125 (Engine Coolant Temperature (ECT) sensor)
P0122, P0123, P0222, P0223 (Throttle position sensor)
P0131, P0132 (air/fuel ratio sensor - ECM input voltage)
P0134, P2195, P2196 (Air/fuel ratio sensor - Output voltage)
P0137, P0138 (oxygen sensor - lack of continuity in circuit)
P0140 (oxygen sensor - output voltage)
P0461, P0462, P0463 (Fuel Level sensor (FL))
P0500 (Vehicle Speed Sensor (VSS))
P0604, P0605 (ECM ROM)
P1160 (throttle return spring)
P2096, P2097 (Post-catalyst fuel trim system)
P2101, P2102 (Throttle actuator control motor)
P2109 (Throttle position sensor minimum stop)
P2119 (Throttle actuator control)
P2122, P2123, P2127, P2128 (Accelerator Pedal Position Sensor (APPS) circuit)
P2135 (Throttle position sensor (TPS) degree of correlation)
P2138 (Accelerator pedal position sensor (APPS) degree of correlation)
Battery Voltage 10.9V or more
F/B operation condition Closed loop
Intake amount per second 5 g/sec or more, and less than 30 g/sec
Catalyst estimated exhaust gas temperature 440°C {824°F} or less
Vehicle speed More than 40 km/h {24.9 MPH}
Variation in oxygen sensor output, after the fuel is cut off, from rich to lean Experienced
EVAP system monitor Control not in progress
Secondary Oxygen sensor element estimated temperature 500°C {932°F} or more
Total intake amount per second 1300 g or more (May change due to an air temperature different than estimated)
Atmospheric pressure 75.06 kPa {563.09 mmHg, 22.169 inHg, 10.884 psi} or more