This code is for the EGR valve. IT may just need cleaning or there is a vacuum leak to it. Best way to clean it is to take it off the manifold and using a brass brush and a chop stick to push into the ports.
P0404 is an exhaust gas recirc problem, referencing the egr valve. replacing it might work. but it is better to troubleshoot it as the are other parameters involved in it's operation
P0404 is an EGR valve problem.
Most are vacuum operated and is set off when the position doesnt match the expected one set by the PCM... however, depending on your location - the van may be equipped with an electrically actuated one that will need to be re-programmed at the dealership.
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Egr valve
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