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egr valve?

my engine light went on and it was coded as po401 flow insufficient so i had the egr valve and gasket replaced, now the engine light is back on, what may be causing this, any chance it could be the converter?

linda
May 2007
Vehicles, CarsValve Light Flow
what car and what year and what engine size are you talking about

jason
May 2007

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EGR Valve PO401 Code - Causes & Fixes