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Home >> Toyota >> 2012 >> 4Runner Trail >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0010-P0327)) >> 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) >> Typical Malfunction Thresholds
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Typical Malfunction Thresholds

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Either of conditions 1 or 2 met -
1. Average of short-term fuel trim and long-term fuel trim 35% or more (varies with ECT)
2. Average of short-term fuel trim and long-term fuel trim -35% or less (varies with ECT)
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