LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2004 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (SFI) - Diagnostics (1ZZ-FE) >> 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

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria Threshold
Either the 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