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Po401 remains on after replacing recomended parts. whatnext

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No one can tell you what to replace

The egr passages have to be clear & not
carboned up

I assume you replaced the valve

There most likely are other parts in the
system & that was what needed to be replaced
or a hose repaired

You gave us no vehicle & we have no data,so
go to You Tube Video & watch the diagnosing of the
egr system for your make car

Posted on Nov 30, 2012

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Posted on Jan 02, 2017

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