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Home >> Lexus >> 2009 >> RX 350 AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control (SFI) System (Diagnostic Codes (P0010-P0420)) >> 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

FUEL TRIM:

EVAP purge-cut Executing
Either of the following conditions is met Condition 1 or 2
1. Average between short-term fuel trim and long-term fuel trim 35% or more at 80°C (176°F) of ECT
2. Average between short-term fuel trim and long-term fuel trim -35% or less at 80°C (176°F) of ECT