DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 52 (Engine Control System (A25A-FXS) - Diagnostic Codes (P0128-P0171)) >> SFI System >> DTC P0171-00: System Too Lean Bank 1; DTC P0172-00: System Too Rich Bank 1; DTC P1170-00: Fuel Performance/Port Injector; DTC P117B-00: Fuel Performance/Direct Injector [12/2019 - 10/2022] >> Monitor Strategy

Monitor Strategy

WARNING: This page is about a different variant/trim than selected.
Related DTCs P0171: Fuel trim lean
P0172: Fuel trim rich
P1170: Fuel trim (port injection fail)
P117B: Fuel trim (direct injection fail)
Required Sensors/Components (Main) Fuel system
Required Sensors/Components (Related) Air fuel ratio sensor (sensor 1)
Mass air flow meter sub-assembly
Crankshaft position sensor
Frequency of Operation Continuous
Duration Within 10 seconds
MIL Operation 2 driving cycles: P0171 and P0172
Immediate: P1170 and P117B
Sequence of Operation None
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