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Home >> Lexus >> 2014 >> IS 250 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (4GR-FSE) - Diagnostic Codes (2 Of 5) >> 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) [04/2013 - 08/2015] >> Typical Malfunction Thresholds
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Typical Malfunction Thresholds

FUEL TRIM

EVAP purge-cut Executing
Either of the following conditions is met 1 or 2
1. Average between short-term fuel trim and long-term fuel trim 35% or higher (varies with engine coolant temperature)
2. Average between short-term fuel trim and long-term fuel trim -35% or less (varies with engine coolant temperature)