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P0401 Diagnostic Trouble Code Discussion for June 2005

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
1999 Ford F-150 Lariat 4.6L MIL Lamp on VIN: 1FTRX17W9X
P0401: Insufficient EGR Flow Detected. It Seems That I Have Replaced Everything In The System, Yet The Code Reappears After A Short Drive @ Operating Temp. My Hands Are In The Air, Any Ideas Will Be Appreciated. Thanks In Advance, Elliot
June 13, 2005
1995 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNDT13W1S
P0401: EGR Isufficent Flow Detected. ... and replying to this request. I have this Chevy Blazer that keeps resetting code p0401. I can request the egr to open and at all %'s there is a change in RPM's. I took off the egr valve, it had a screen that was not blocked at all, ports seem to be clear. ...
June 16, 2005
1999 Mercury Cougar 2.5L MIL Lamp on VIN: 1ZWFT61L4X
P0401: insufficient egr flow detected. had 401 code checked for idle drop on engine with vac. applied to egr. no drop in rpm checked cleaned throttle body passeges now engine dies with vac applied. ran koer test to confirm fix, 1408 comes up(egr flow out of range) checked vac to egr with koer dema...
June 19, 2005
1997 Ford F-250 Lariat 4.6L MIL Lamp on VIN: 1FTFF2861V
P0401: EGR flow insufficiant. Have this Ford 4.6 windser has code P0401 insuficiant egr flow checked all systems run all test pass took egr valve off no blockage checked out dpf sensor good, no blockage in exhaust tube when had egr valve off started engine no differance with the hole plugg...
June 29, 2005