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P0401 Diagnostic Trouble Code Discussion for December 2008

Insufficient EGR Flow Detected


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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2003 Ford F-150 XLT 4.6L Misfire, MIL Lamp on VIN: 1FTRW07643
P0401: Insufficient EGR Flow Detected (ESM System). ... rough , asks about spark plugs.Scanner wont read codes "no power from vehicle" message , turns out fuse 3 is blown.Replaced the fuse and retrieved codes , misfire in freeze frame for cyl # 4 .KOEO test came up with P0016 CKP CMP correlation code fo...
December 01, 2008
2000 Toyota RAV4 2.0L MIL Lamp on, slight knocking VIN: JT3HP10VXY
P0401: EGR System Insufficient Flow Detected. Thank you in advance Toyota gurus.New customer, overall condition of vehicle good. During test drive with scan tool engine had slight pinging under load. PO401 resets after two test drives. Replaced modulator and VSV after checking valve manually and visual on...
December 05, 2008
1998 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZG5281W
P0401: egr flow insuffient. VEHICLE HAS TOTAL OF 8 CODES SAME AS ABOVE PLUS PO507 IDLE CONTROL SYSTEM (RPM TOO HIGH )AND PO1404 EGR-2 POSITION ERROR/EGR CLOSED PERFORMANCE. O2 SENSOR LOOKS GOoD ON THE MODIS,TPS VOLTAGE IS .25V AT IDLE AND 3.3 AT WOT,WHEN I UNPLUG MAP SENSOR I GET .5V AN...
December 08, 2008
1999 Ford Windstar SE 3.8L egr passage VIN: 2FMZA5242X
P0401: egr flow. thanks in advanced, have a windstar i know the egr passages are clogged except cylinder #2. if any one has cleaned the egr passages out before. wandering if i could do it with out removing the intake. or will that not be sufficant enough not sure how the passa...
December 11, 2008
1997 Chrysler Concorde LX 3.5L MIL Lamp on VIN: 2C3HD56F6V
P0401: EGR System Performance. Vehicle came in with P0401 EGR system failure. Engine would not stumble or stall with the EGR electrical connector disconnected and exhaust plugged. Replaced EGR valve assy. with OEM unit. On test drive EGR monitor passed the first time. Gave car back to custo...
December 17, 2008
1997 Chrysler Concorde LX 3.5L MIL Lamp on VIN: 2C3HD56F6V
P0401: EGR System Performance. Vehicle came in with P0401 EGR system failure. Engine would not stumble or stall with the EGR electrical connector disconnected and exhaust plugged. Replaced EGR valve assy. with OEM unit. On test drive EGR monitor passed the first time. Gave car back to custo...
December 23, 2008
1997 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL52M9V
P0401: Insufficient EGR Flow Detected. this car keeps setting a po401 code. trying to get it to pass inspection. the car does have a lot of miles which may be a factor. however it runs amazingly well for its miles; no misfire, starts easy and runs smooth. i have replaced the egr valve and the ports...
December 29, 2008
1996 Toyota RAV4 2.0L Hesitation, MIL Lamp on VIN: JT3G10V8T7
P0401: EGR System Insufficient Flow Detected. ok i am stumped, this little rav4 came in check engine light on code po401 egr lack of flow. tested the egr valve with vacuum pump and diaphram leaks vacuum so i replaced it, and test drove and light came back with same code, further tested vacuum modulator fo...
December 30, 2008