2001 F250 7.3 4r100 4x


ive finally got all the issues fixed, trucks running great!
however, my CEL light keeps coming on.
hook up the scanner (snap on solus)
and it keeps telling me "no codes present"


I go into the memory codes, and its showing me 2.
P1000 OBD II system check incomplete
P0676 #6 glow plug,
plugs have been replaced, and ive performed all functional tests successfully...


I clear codes, and within a mile the CEL comes back on.
hook the scanner to it again "no codes present"
its done this 4 times.


whats going on here???