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P0401 Diagnostic Trouble Code Discussion for October 2008

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2000 Ford Taurus SE 4-Valve 3.0L Hesitation, MIL Lamp on, Won't Upshift VIN: 1FAFP56SXY
P0401: Insufficient EGR Flow. About 2 weeks ago, only P0401 code, didn't have time to fix yet, but last night, customer called with problem with transmission not shifting out of second, a/c not working, and poor drivability. Scanned computer, and noticed multiple codes (stated below). Seem...
October 08, 2008
1999 Chevrolet Venture 3.4L MIL Lamp on VIN: 1GNDX03E0X
P0401: Insufficient EGR Flow Detected. We have replaced the EGR valve and cleaned the tube leading from the exhaust manifold to the valve. We have also cleaned out the ports in the intake where the valve is mounted but still no fix.
October 11, 2008
1999 Ford Windstar SE 3.0L Excessive Emissions, MIL Lamp on VIN: 2FMZA5247X
P0401: Egr flow insufficient. This vehicle as well as a 1999 Ford Explorer comes back approx every 6 to 8 months with a P401 code when itest sensors on both of these vehicles i always have reference voltage shorted to the signal wire the pressure hoses are allways attached and there is no ...
October 13, 2008
1996 Toyota Corolla DX 1.8L MIL Lamp on VIN: 1NXBBO2E3T
P0401: insufficient flow EGR. customer came in with PO401 insufficent flow egr. I replaced the egr valve, tested the egr solenoid (ok)and the ground from the computer is good to the solenoid. Catalytic convertor is good (no back pressure). I looked at the passages on the egr side of the in...
October 19, 2008