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Home >> Toyota >> 2013 >> Prius Two >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P00100 - P2402)) (Except Plug-In) >> SFI System >> DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1) >> Typical Enabling Conditions
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Typical Enabling Conditions

Monitor runs whenever following DTCs are not present P0010 (Camshaft timing oil control vale assembly bank 1)
P0011 (VVT system bank 1- advance)
P0012 (VVT system bank 1- retard)
P0016 (VVT system bank 1 - misalignment)
P0031, P0032, P101D (Air fuel ratio sensor heater - sensor 1)
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)
P0335 (Crankshaft position sensor)
P0340, P0342, P0343 (Camshaft position sensor)
P0351, P0352, P0353, P0354 (Igniter)
P0401 (EGR system (closed))
P219A (Air fuel ratio sensor - imbalance)
Fuel system status Closed-loop
Auxiliary battery voltage 11 V or more
Either of the following conditions 1 or 2 is set -
1. Engine speed Less than 1100 RPM
2. Intake air amount per revolution 0.12 g/rev or more
Catalyst monitor Not executed
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