1995 Toyota Tercel Q&A
1995 Toyota Tercel Question: Cause of EGR no flow code,p0401, when egr is still good?
here is an article I wrote on Toyota PO401 code inspections. I would go through this article step by step. First thing to do is to raise the valve with a vacuum pump and the engine should die IMMEDIATELY, if not the system HAS to be cleaned out, I do Emissions work in CA and so I do this type of Diagnosis and repair every week. Trust me, make sure those EGR Passages are squeaky clean, then go from there, Good luck and ask more questions if needed. - dandd