Hi vetcprelude,
P0401 = EGR insufficient flow.
Replacing the EGR valve would not help if the ports are clogged. You would need to clear the clogging of the exhaust passage under the EGR valve. Carb cleaner can help to loosen the carbon and compressed air would do the rest. Some digging might be required.
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Sunday, November 22nd, 2009 AT 12:54 PM