LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2004 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Control System (SFI) - Diagnostics (2ZZ-GE)) >> DTC P0171: System Too Lean (Bank 1), DTC P0172: System Too Rich (Bank 1) >> Typical Malfunction Thresholds
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Typical Malfunction Thresholds

WARNING: This page is about a different variant/trim than selected.
TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria Threshold
Either the following condition is continued 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