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P0401 Diagnostic Trouble Code Discussion for May 2011

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2005 Honda Civic EX 1.7L MIL Lamp on, p0401 VIN: 1HGEM22965
P0401: EGR System Insufficient Flow Detected. Hello again, This car came in with a P0401 EGR flow problem and a MIL for a New York State Inspection. The customer states he has "poked around under the hood and tried to find the problem" but gave up after seeing the complexity of the engine bay. We...
May 18, 2011
2002 Mitsubishi Montero Limited 3.5L MIL Lamp on VIN: JA4MW51R02
P0401: Insufficient EGR Flow Detected. ... appreciated. Not sure if I am missing something or not. Truck came in with a P0401 and a P0431 code. Tested EGR system. Ran vehicle and hand operated valve. Engine stumbled and died. Checked vacuum lines for restrictions. Cleaned out vacuum ports on top of...
May 18, 2011
2008 Mazda CX-7 Sport 2.3L MIL Lamp on VIN: JM3ER293X8
P0401: Egr Insufficient Flow. ... fault p0401, engine running on demand fault. I have checked the egr internal solenoids and found them all 4 to be at 11.2 ohms, Mitchell says the spec 8-9 ohms, I can command the egr valve open with the scan tool and it will siginificantly bring the engine...
May 23, 2011
1995 Buick LeSabre Custom 3.8L Hesitation, MIL Lamp on VIN: 1G4HP52L8S
P0401: Egr flow. I have this LeSabre that is causing me a real headache. The problem occurs completely intermittently and seems to have no common factors that cause it to happen. What happens is during accelleration it hesitates. Now to me it feels like a plugged converter, th...
May 31, 2011