LEMON Manuals: Even more car manuals for everyone: 1960-2025

Home >> Buick >> 2002 >> Regal LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0401: EGR System Insufficient Flow >> Conditions For Setting DTC

April 5, 2026: LEMON Manuals is launched! Read the announcement.

Conditions For Setting DTC

DTC sets when MAP changes monitored during EGR flow test indicate an insufficient EGR flow.

scientia non olet · About LEMON Manuals