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P0401 Diagnostic Trouble Code Discussion for November 2008

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
1997 Chevrolet Monte Carlo LS 3.1L MIL Lamp on, EGR low flow VIN: 2G1WW12M4V
P0401: Insufficient EGR Flow Detected. ... on and has no other complaints. Checked codes and found P0410 EGR flow low and P0134 Bank 1 sensor 1 sensor slow switching. Checked flow chart and found that MAP sensor is used to detect EGR flow on decel above 30 mph. Checked EGR ports and were very clean...
November 08, 2008
2000 Hyundai Sonata 2.4L MIL Lamp on VIN: 0WHC37808Y
P0401: EGR System - Insufficient Flow Detected. Calling all Hyundai techs. Help needed!! This is a good customer of mine so this is embarassing. MIL came on for EGR insufficant flow. I tested it and found that the passages were dirty because it barely stumbled. I cleaned the passages and the RPM drops drast...
November 17, 2008