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P0401 Diagnostic Trouble Code Discussion for September 2005

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2001 Mitsubishi Diamante LS 3.5L MIL Lamp on VIN: 6MMAP67P01
P0401: Insufficient EGR Flow Detected. This Mitsubishi has a code P0401. Alldata skips right over the code and does not list it for this vehicle. However, that't the code it has and going by the code description, it is insufficient EGR flow. Freeze frame has it setting hot, at 45 mph, light load. I...
September 09, 2005
1998 Ford E-350 Econoline XL 5.4L MIL Lamp on VIN: 1FDWE37L4W
P0401: insufficient egr flow. ... had it repaired, replaced egr solenoid. The light turned off, but later turned on again. Same code p0401. I checked egr and it held vacuum. checked vacuum lines to egr, they held vacuum. checked egr source, it also held vacuum.
September 12, 2005
1998 Chevrolet K2500 Cheyenne 6.5L Excessive Emissions, Hesitation, MIL Lamp on VIN: S6WE114333
P0401: Insufficient EGR Flow Detected. Have low power at times while accelerating with heavy black smoke. Worked on turbo first to see if causing problem with coded p0236. Control working and turbo working. Then moved on to egr codes, found when problem accured the desired egr and the actuall egr w...
September 19, 2005
2001 Toyota Camry LE 2.2L MIL Lamp on VIN: JT2BG22K71
P0401: EGR System Insufficient Flow Detected. I am posting this to answer the problem of the egr vsv being mysteriously bad while testing good. Look further for the fix.
September 20, 2005
1999 Mercury Sable LS 3.0L MIL Lamp on VIN: 1MEFM53S8X
P0401: EGR Insufficient Flow. The P1408 Has not returned, only the P0401. The Snap on scan tool shows the DPFE sensor voltage is 1.07 volts. This is KOEO or KOER. If I Unplug the sensor, the voltage goes to 5.12 volts. At the sensor connector I have 3.39 volts from a good ground to either ...
September 27, 2005