I have seen lots of threads on this. Performed the procedure to clean the egr port, (did it 24,000 miles back and all was good) code cleared after I unhooked negative battery cable. Check engine light came back next day, performed the reseat of fuse #12. Code cleared for like almost 2 days. Check engine light back on today. Is it possible the egr valve really needs replaced? I don't know, any suggestions would be greatly appreciated.