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International Automotive Technicians Network

P0401 Diagnostic Trouble Code Discussion for May 2004

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
1996 Acura TL 3.2L Excessive Emissions, Tailpipe smoke @idle VIN: JH4UA3640T
P0401: EGR System Insufficient Flow Detected. Hi there folks. I hope somebody knows what is ailing this car. The customer originally brought it in for smoke from the tailpipe at idle. I checked it out and found the smoke to smell like sulfer, so I checked the emissions and found the CO to be higher than n...
May 03, 2004
1999 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52K1X
P0401: Insufficient EGR Flow Detected. this car would go nuts when we first got it. on the test drive it would buck, surge, trailerhitch, fishbite, chuggle, and everything else -- consistantly intermittant. We scoped the maf, and had good power, and ground. the signal output or frequency output was...
May 03, 2004
1995 Dodge Neon 2.0L MIL Lamp on VIN: 1B3ES27C1S
P0401: EGR system failure. ... another tech, it has a P0401 code in it that is intermittent and comes back after approx 300 miles I have ran the egr test with the DRB and all looks good. When you run the test you can see the stem of the valve move and the tube from the exhaust manifold ...
May 04, 2004
1997 Oldsmobile 88 Royale 3.8L MIL Lamp on VIN: 1G3HN52K5V
P0401: Insufficient EGR Flow Detected. hello eveyone need some help here car came in with siezed motor replaced motor upper and lower intake manifolds. car ran fine no codes. after 1 week customer returned found code po401 inssuficant egr flow. Tested egr and map sensor seem to working properly any...
May 13, 2004
1996 Toyota Tercel DX 1.5L MIL Lamp on
P0401: EGR System Insufficient Flow Detected. Hi mil light on code po401 egr valve ok,i have vacuum from egr amplifire,egr opens with the throutle opening,changed egr amplifire just in case.i cleaed the codes after driving several miles mil light come back on,i can't understand what is going on egr system...
May 21, 2004
1996 Buick Skylark Custom 3.1L MIL Lamp on VIN: 1G4NJ52M6T
P0401: Insufficient EGR Flow Detected. Hello fellow IATN Techs, Got A problem with A EGR I went to the Archives and found lots of help,most of the time we find the answer, But one tech, answered A post on 4/20 2003 his name is Tom from Ohio, Said he had had A similar problem with A skylark code PO4...
May 31, 2004