I have a 96 explorer 4.0 ohv with the check engine light on. A scan
indicates code 401, insufficient flow detected. Mechanic replaced egr
valve and cleared the code. CEL came pack on, code 401. I replaced the
DPFE sensor and both hoses. Blew through both hoses to make sure there
was no blockage and cleared the code. CEL came back on within 30 miles,
same code. HELP!! running out of ideas.
Jack
