Check engine code 1866

[vasyok8585]

Hi guys,
I need some help, I have some issues with cummins isx 15 CM2350, few months ago got check engine light, code 1866( differential pressure sensor),replaced egr differential pressure sensor, imap sensor, back pressure sensor, egr temperature sensor, code back on.
But.... code is completely gone when outside is cold , when outside is over 50F code back on and I fill power loss.