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P0401 Diagnostic Trouble Code Discussion for August 2007

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
1999 Toyota RAV4 2.0L MIL Lamp on VIN: JT3HP10V3X
P0401: EGR System Insufficient Flow Detected. this vehicle can not pass obdII emissions test. the cel light is on with code po401. all testing done indicated egr is running as it should be. i put a vacuum gauge on the vacuum switch, and it shows vacuum at mid rpms. i put a vacuum pump on the egr valve, an...
August 03, 2007
2003 Ford F-250 Super Duty XLT 6.0L MIL Lamp on VIN: 1FTNW20P43
P0401: Insufficient EGR Flow Detected. ... expert as we do not see or work on too many diesel applications-customer was a regular so we took a shot at it-truck came in a few weeks ago with the check engine lite on-it had a p0401 code-we pulled the egr assy out it was coked up with carbon-so we inst...
August 27, 2007
1999 Toyota Camry CE 2.2L MIL Lamp on VIN: 4T1BG22K2X
P0401: EGR System Insufficient Flow Detected. Apply vacuum to EGR valve while running(idle) car will stall. Rev engine above idle while feeling EGR diaphram with fingers to confirm valve is working. All seems ok. What causes code to keep reseting.No other codes are set and car runs ok.
August 29, 2007