You are looking at the EGR code, I believe.
This EGR code is a common fault on 104 eng . Search archives for S.B's article on the EGR tube plugging up at the intake feed port of the head.
There is also a part change modification.
Simple test for port clog is to apply vac to egr servo at idle . Shoud run rough if port is clear. No change indicates egr/plug tube diagnoses.