LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Acura >> 2000 >> Integra GS-R, 4D Sedan >> Repair and Diagnosis >> External Pages >> Different car >> Section 1 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0401: EGR - Insufficient Flow Detected
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC P0401: EGR - Insufficient Flow Detected

WARNING: This page is about a different car, the 2000 Acura 3.5RL. However, it is still accessible from the selected car via links, so may be relevant.
  1. If DTC P0401 is set, check for a clogged or leaking EGR line and a faulty EGR valve. Repair or replace components as necessary. If no problems are found, go to next step.
  2. Perform PCM reset procedure. See PCM RESET PROCEDURE/CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Install SCS Service Check Connector Tool (07PAZ-0010100). See Figure. Test-drive vehicle with no electrical load and A/T in D4 position. Decelerate gradually from 55 MPH for at least 5 seconds. If DTC P0401 resets, go to next step. If DTC P0401 does not reset, problem is intermittent. System is okay at this time.
  3. Clean intake manifold EGR port and EGR passage with carburetor cleaner. Clean passage inside EGR valve with carburetor cleaner, or replace EGR valve as necessary.
scientia non olet · About LEMON Manuals