p0404 egr code caused by bad catalytic???

P0404 code and puking p0404 P0404 code repair Code 404 is for a problem with the EGR valve circuit The valve may be open or closed when it should not be p0404 Code P0404 usually indicates that there is a carbon build-up somewhere in the lines, or on other occasions, a bad EGR valve

p0404 Some vehicles may store EGR control performance code P0404 This occurs when the difference between commanded and actual EGR valve position is more than 10%