I dont know to much about tunners so take this FWIW
It just makes me wonder since the EGT Probe isnt reading and if the tunner should turn off the CEL for a EGR Deleate and it doesnt Makes me wonder about the Tunner
Im kinda thinking you need a new tunner same as you
Is there anyway to reset the tunner?? I just dont know to much about them
Here is a Bump for ya and maybe one of the TUNNER GURUs will hit this thread