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Home >> Lexus >> 2005 >> LX 470 >> Repair and Diagnosis >> Engine Performance >> System >> Engine - Diagnostics >> Circuit Inspection >> DTC P0171: System too Lean (Bank 1), P0172: System too Rich (Bank 1), P0174: System too Lean (Bank 2), P0175: System too Rich (Bank 2) >> Typical Malfunction Thresholds

Typical Malfunction Thresholds

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria Threshold
Following condition is continue for 9 sec. A or B
A. Smoothed fuel trim learning value (Lean) 40% or more (ECT 80°C (176°F))
B. Smoothed fuel trim learning value (Rich) -35% or less (ECT 80°C (176°F))