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Home >> Toyota >> 2021 >> Prius LE AWD-e >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (3 Of 8) >> SFI System >> DTC P0171-00: System Too Lean Bank 1; DTC P0172-00: System Too Rich Bank 1 [11/2015 - 12/2018] >> 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)
P0101, P0102, P0103 (Mass air flow meter)
P0107, P0108 (Manifold absolute pressure)
P0117, P0118 (Engine coolant temperature sensor)
P0121, P0122, P0123, 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 - P0354 (Igniter)
P0401 (EGR system)
P219A, P219C, P219D, P219E, P219F (Air-fuel ratio imbalance)
Fuel system status Closed loop
Auxiliary battery voltage 11 V or higher
Either of the following conditions is met 1 or 2
1. Engine speed Less than 1100 rpm
2. Engine load 10% or higher
Catalyst monitor Not executed
Air fuel ratio imbalance of clogged EGR runner fail Not set
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