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P0401 Diagnostic Trouble Code Discussion for October 2007

Insufficient EGR Flow Detected


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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2000 Saturn LS2 3.0L Hesitation VIN: 1G8JW52R8Y
P0401: Insufficient EGR Flow Detected. Hi, This Saturn has something unusual going on. The Genisys shows the following readings and yet the engine runs well except for an occasional hesitation. Some of the DTC's seen on the Genisys cannot be found in Mitchell. All readings below were taken from the...
October 01, 2007
1998 Toyota RAV4 2.0L MIL Lamp on VIN: JT3XP10VOW
P0401: EGR System Insufficient Flow Detected. O.K. all you Toyota experts, this rav4 keeps having a CEL and setting a code P401, we tested and found everything was working fine. WE changed the EGR solenoid and it still happened, so we changed the EGR. Still happening, The passage is clear and the transduc...
October 02, 2007
2002 Mazda Protege5 2.0L Poor Idle Quality VIN: JM1BJ24582
P0401: EGR System Insufficient Flow Detected. Hi all, I have the above mentioned vehicle in our shop today. The vehicle arrived this morn with a heavy surge/chug and light missfire at idle, yet smoothes out upon acceleration. The mentioned codes are present, I believe the missfire is present due to a poss...
October 04, 2007
1999 Isuzu Rodeo S 2.2L MIL Lamp on VIN: 4S2CK58D7X
P0401: Insufficient EGR System Flow Detected. po342 I believe is going to be a replacement camshaft position sensor, even though it looks fine on a lab scope. This code will set intermittently just after start-up. I did confirm clean ground (common with crank sensor). po401 is really driving me crazy. Th...
October 10, 2007
1998 Ford Expedition XLT 5.4L MIL Lamp on VIN: 1FT23G4326
P0401: egr flow. ... every 3-6 months for this code (p0401) This last time I checked the dpf sensor and found water in it, Both lines that go into it come from the exhaust below the sensor one is the intake side and the other is the exhaust side, is the water causing this prob...
October 12, 2007
2000 Mazda MPV DX 2.5L MIL Lamp on VIN: JM3LW28G5Y
P0401: EGR System Insufficient Flow Detected. this mazda triggered a P0401 code which is Insufficient EGR flow detected. customer is very picky about his minivan and wants it fixed.The problem is that I dont know what to fix. EGR passages are clean, the vacuum hoses are not collapsed and they are connecte...
October 22, 2007
1995 Lexus ES300 3.0L Cuts out, MIL Lamp on VIN: JT8GK13T2S
P0401: Insufficient EGR Flow Detected. ... help request. This '95 ES300 came to me with the MIL on and the customer stating that the vehicle runs fine, no performance issues. DTC P0401 EGR Insufficient flow was the only code at this time. Diagnosed and found a faulty VSV (Vacuum Switching Valve/EGR...
October 26, 2007
1995 Lexus ES300 3.0L Cuts out, MIL Lamp on VIN: JT8GK13T2S
P0401: Insufficient EGR Flow Detected. ... help request. This '95 ES300 came to me with the MIL on and the customer stating that the vehicle runs fine, no performance issues. DTC P0401 EGR Insufficient flow was the only code at this time. Diagnosed and found a faulty VSV (Vacuum Switching Valve/EGR...
October 27, 2007