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My check engine light is on and a code of p0401 comes with insufficient egr flow. I replaced the egr valve and the vacumn solenoid but the light still comes on. Any answers to my problem?


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check the connection on the passenger exhaust manifold and all the line running to the upper intake on the drivers side.
 

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Check out this link below, maybe the sensor or switch. I went through this on my V10, checked the code, cleared the codes by disconnecting the battery a few times, always came back on a day later. All this around inspection time. Did nothing then it just went away, hasn't been back on for 6 weeks. It would usually come about once a year.


http://www.obdiicsu.com/Studies/1999CaseStudies/study.html
 
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