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P0401 Diagnostic Trouble Code Discussion for November 2005

Insufficient EGR Flow Detected


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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2002 Ford Explorer Sport Trac XL 4.0L MIL Lamp on VIN: 1FMZU77ES2
P0401: insufficient egr flow. mil light comes on and code 401 { insufficient egr flow}Can clear codes and the light may not come back on for 2 days,some times longer. Found no exhaust or vacuum leaks. have tried new DPFE,solinoid ,and egr valve . Have checked pipes from exhaust to valve et...
November 01, 2005
2001 Chevrolet Impala 3.4L MIL Lamp on, fALSE CODE???
P0401: Insufficient EGR Flow Detected. ... this line of work. I have an'01 Impala 3.4 that sets P0401 as soon as it gets a couple of blocks away; didn't think it would even run test that soon. Are there known reflash issues with these, or hidden TSB's, or am I just extremely lucky this month? I've...
November 16, 2005
2001 Mercury Sable LS 3.0L Misfire VIN: 1MEFM53U51
P0401: insufficient egr flow. replace plug, wire, coil pack [no change] can hear injector popping did compression test came out OK. egr has been replaced. customer has had car to other shops before us with no success. please help.
November 17, 2005
1999 Toyota RAV4 2.0L MIL Lamp on VIN: 3T3HPIOV5X
P0401: EGR System Insufficient Flow Detected. TO ALL TECHS,we have po401 code,THATS NOT THE PROBLEM.THE PROBLEM IS WHEN USING THE VETRONEX MASTERTECH GLOBIAL WORKS OK, WHEN WE GO TO TOYOTA OE SIDE THE ENGINE STUMBLES AND STALLS THEN THE SCAN TOOL READS NO COMMUNICATION.IT WILL NOT GO INTO OE AT ALL.NOW IS...
November 18, 2005