intermittent spn 0102 fmi 18 cm871

[jgriffin812]

How much of a derate could I get if somehow my egr were to become plugged up and my egr temp sensor lost connection? I recalibrated my actuator and did a smoke test on the cac and beyond, no found leaks. Put it all back together and it got the 102 fmi 18 code, again, and was sputtering, that was new, and then after turning around and heading back I got upto 33 psi with the check engine light still on. There was also an exhaust back pressure code 1209 fmi 16 I believe but it cleared itself before the low boost code. Thanks for your knowledge and help to this struggling owner operator.