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Home >> Toyota >> 2021 >> Sequoia TRD Pro >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Control System (3UR-FE) - Diagnostic Codes (3 Of 9) >> SFI System >> DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1); DTC P0174: System Too Lean (Bank 2); DTC P0175: System Too Rich (Bank 2) [08/2015 - 08/2019] >> Typical Enabling Conditions
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Typical Enabling Conditions

Monitor runs whenever following DTCs not present P0010, P0020 (VVT Oil control valve)
P0011, P0021 (VVT System - Advance)
P0012, P0022 (VVT System - Retard)
P0013, P0023 (Exhaust VVT Oil control valve)
P0014, P0024 (Exhaust VVT System - Advance)
P0015, P0025 (Exhaust VVT System - Retard)
P0016, P0018 (VVT System - Misalignment)
P0017, P0019 (Exhaust VVT System - Misalignment)
P0031, P0032, P0051, P0052, P101D, P103D (Air fuel ratio sensor heater)
P0102, P0103 (Mass air flow meter)
P0115, P0117, P0118 (Engine coolant temperature sensor)
P0125 (Insufficient coolant temperature for closed loop fuel control)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor)
P0335 (Crankshaft position sensor)
P0340, P0342, P0343, P0345, P0347, P0348 (VVT sensor)
P0351 - P0358 (Igniter)
P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT sensor)
P0412, P0415, P0418, P0419, P1613, P1614 (Secondary air injection system control)
P1340 (Camshaft position sensor)
P2440 - P2447 (Secondary air injection system)
P0500 (Vehicle speed sensor)
Fuel system status Closed loop
Battery voltage 11 V or more
Either of following conditions 1 or 2 set -
1. Engine speed Below 1100 RPM
2. Engine load 10% or higher
Catalyst monitor Not executed
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