400 is an egr flow code. The valve cannot be cleaned. It would have to be replaced, if it is the proble, Passages need to be checked to be sure that there is sufficient vacuum to the valve and the passage to the manifold as well.
If there is a code, you have an egr valve. There is no motor listed so I cannot help you any further.
Sunday, June 16th, 2013 AT 8:03 AM