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P0401 Diagnostic Trouble Code Discussion for February 2007

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2004 Pontiac Grand Am SE1 3.4L MIL Lamp on VIN: 1G2NF52E94
P0401: Insufficient EGR Flow Detected. one of my customers called me to fix this problem after another shop replaced egr valve with a new factory unit and also claimed to have cleaned egr ports. i can see a new plenum gasket which does tell me that they probably did. this code has come back everyti...
February 10, 2007
1995 Toyota Tacoma DLX 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 4TAVN53F9S
P0401: Insufficient EGR Flow Detected. This truck came from a car lot who traded it in so I know nothing about when the symptoms started or any repair history. The complaint is a misfire. It has a Check Engine light on with numerous codes. Having worked on these engines some in the past, I am aware...
February 28, 2007