Quote Originally Posted by BillBoost37 View Post
First thing I'd do is read up on the code. I've found the FSM's are scanned in at Gearchatter.com for other GM's, but they are all the same stuff and steps for us. Search there for your code.

Now.. which sensor has been replaced, front or back? Bank 2 IIRC is the back one. The back sensor has an extension wire on it that comes from the sensor and clips on the back of the ps pump (stock). If enough work has been done on the car, that wire will be laying on the trans and possibly near the spinning axle. From there it heads into the loom, around the entire motor and to the pcm.

A power problem doesn't mean bad sensor. Read up on that FSM page and you'll see what I mean. Could be as silly as a fuse that feeds the circuit, but I doubt it.
its the rear sensor. 2nd time its been replaced. the wiring didnt look like it had been messed with. ill check out that site though