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This is generally the explanation when you get a PO401 check engine code. It is ussually caused when the carbon builds up in the channel leading from the EGR through and into the thottle body. Most of the time it can be fixed by cleaning the passage with a good carb cleaner and a wire pipe cleaner restoring the flow of air through the passage. Sometimes you might have the replace any one of the EGR Value, EGR Solinoid or the EGR Pressure Sensor. These can be costly, so begin with the cleaner. You may have to remove the thottle body face plate to gain better access to the channel.
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