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Home >> Lexus >> 2010 >> SC 430 >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System (Diagnostic Codes (P0010-P0340) >> 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

Purge-cut Executing
Either of following conditions (a) or (b) is met -
(a) Average between short-term fuel trim and long-term fuel trim 35% or more (varies with ECT)
(b) Average between short-term fuel trim and long-term fuel trim -35% or less (varies with ECT)