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Home >> Lexus >> 1995 >> ES 300 >> Repair and Diagnosis >> External Pages >> Different car >> Section 12 (Engine Controls - Tests W/Codes - OBD-II) >> Diagnostic Testing >> Code P0401: Insufficient Exhaust Gas RECIRCULATION (EGR) Flow Detected >> Test Drive Confirmation
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Test Drive Confirmation

WARNING: This page is about a different car, the 1995 Lexus LS 400. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect scan tester to Data Link Connector (DLC) No. 3. See Figure. Start and warm engine to normal operating temperature. Operate vehicle at 43-56 MPH for 3 minutes or more. Stop vehicle and allow to idle for about 2 minutes. Turn ignition off.
  2. Start engine and allow to idle. Operate vehicle at 43-56 MPH for 3 minutes or more. Stop vehicle and allow to idle for about 2 minutes.
  3. Check READINESS TESTS mode on scan tester (may also be known as I/M FLAG). If COMPL is displayed on scan tester and MIL is not illuminated, system is normal. If INCPL is displayed and MIL is not illuminated, repeat test drive procedure.
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