LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 2001 >> Impala LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0171: Fuel Trim System Lean - Bank 1 >> Code Enable Criteria
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Code Enable Criteria

DTC sets when average long term fuel trim value is more than 20 percent for more than 6 seconds.