1997 M3
2002 ls1/t56 pullout

So got the car running finally and have codes for both banks of o2.
p0134 an p0154

Rear o2 sensors have been deleted via software.

Also swapped the pinouts to the rear o2 wires to have the longer wires for long tubes.

Im thinking when i removed some excess wire from the harness i removed the o2 grounds. Where do they need to be ground properly?

Any ideas of how to trouble shoot this properly?
TIA