30ff after o2 sensor install

White Sands

Lurker
May 21, 2019
17
2
0
Ride
BMW e90 335i
I just replaced my pre-cat bank 1 & 2 o2 sensors, reset adaptations and went to log.
Soon as I hit WOT got a half engine light and 30ff.
Prior to this I have never had a 30ff
I didn't mess with anything else on the car other

Could a loose o2 sensor (not properly torqued) cause a 30ff?