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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 463 (Engine Control System (SFI) - Diagnostics) >> DTC P0171: System Too Lean (Bank 1) DTC P0172: System Too Rich (Bank 1) >> Typical Malfunction Thresholds

Typical Malfunction Thresholds

WARNING: This page is about a different car, the 2004 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria Threshold
Following condition is continue for 3 seconds ("a" or "b")
(a) Smoothed fuel trim learning value (lean) 35 % or more
(b) Smoothed fuel trim learning value (rich) -35 % or less