Recently install Dynatech headers and catted y pipe. I have downloaded the tune file to my hpt, but not certain which sensors are the rears. Can someone tell me which PO #'s need disabled?

It's a 2007 Silverado Classic with 6.0.

 

If you have cats, then you shouldn't have to disable anything for the rear sensors.

Regardless...the REAR O2 (HEGO) sensors are always SENSOR 2
Bank 1 is driver's side and Bank 2 is passenger side.

 

I was always under the impression that with after market high flow cats, the rear o2's needed to be turned off.

Thanks for the info.