P0134, P0154 codes after Long tubes

[Vinny]

I have a 02 Trans am and i just installed Pace setter LTs on it. I thought I already turned the O2s off but maybe not. I unplugged the front O2s and installed the rear O2s in the bungs on the headers thinking this would be alright but now I get these codes saying "no activity" on bank 1,2 sensor 1. I can't remember how to turn the o2s off. Can someone lend a hand?

Its a U7198.

Thanks
Vinny

[tuningss]

The front o2's MUST be installed in the correct location or ALL fuel calculations will be off.

[Vinny]

So I just need to reconnect the fronts and disconect the rears. I thought when I turned them off they were "OFF" and I could do anything I wanted with them.

[mikel]

So I just need to reconnect the fronts and disconect the rears. I thought when I turned them off they were "OFF" and I could do anything I wanted with them.

Yeah, the car will not run properly without front O2 sensors....

[Vinny]

Thanks!