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P0401 Diagnostic Trouble Code Discussion for October 2009

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
1999 Ford E-150 Econoline 4.2L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1FTRE1429X
P0401: egr insufficent flow. ... with the p0340 code. Runs very bad, misses, running rich, fouling plugs with fuel. Went to iatn identafix. Tons of hits on Alt and dpfe causing signal problems with sensor. Replaced dpfe(P0401) and unplugged alt and radio suppresor at coil. Ran better, sto...
October 05, 2009
1998 Mercury Grand Marquis GS 4.6L Cuts out, MIL Lamp on VIN: 2MELM74W1V
P0401: insufficiant exhaust gas flow. car came in with 401 code first replaced dpfe,egr,pressure sensor, still customer complained car runs bad and dies when first starting up. advised customer to leave car next day we found car acting up removed throddle body and did and complete cleaning. car ca...
October 20, 2009
1995 Lincoln Town Car Executive 4.6L Poor Idle Quality, Misfire VIN: 1LNLM82W05
P0401: egr insufficient flow detected. when car is started cold, car runs fine. after running for around 5 minutes it begins to misfire. traced to cylinders #1 and #6. when you remove the spark plug wires from those 2 spark plugs no difference is made. we have good spark at the plugs. we installed ...
October 23, 2009