1994 Ford Aspire "focus p1412" Questions

P1412, P0490 and P1335 stored Model: Focus C-MAX 2003.75 (06/2003?¿½) Build Date: 14.02.2004-01.03.2006 Build Code: 4R-6S Assembly Plant: Saarlouis Engine: 2.0L Duratorq-TDCi (DW) Diesel Focus 2004.75

focus 16tdi code p1412 car revs die down then pick back up it's a seized EGR valve

code P1412 DTC defintion not found engine will not start but will fire and smoke This is an EGR valve code. The valve may be seized/stuck