It was the hose, I cut it when taking out the stupid false firewall, thanks for the help!

2009 S80 T6, Not sure what I could have done but.... I took half the top of the motor apart to reach the bank1 O2 sensor, replaced it, put it all back together now the brakes are real stiff and barely stop the car when I stomp on them. I took all the plastic crap off again and checked all the wiring...