Home >> Lexus >> 2004 >> ES 330 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnosis >> 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 Enabling Conditions