What are the codes you are getting, I got a P0133, slow response code accompanied by a lean code I think it was P0171, and replaced my o@ sensor on bank1sensor 1 twice to no fix, Then I checked for intake leaks, and found one, which was the actual source of the problem. But the O2 sensor it located on the exhaust manifold right as the 4 pipes join to one. its a simple matter of unplugging the o2 sensor, obtaining an o2 sensor removal tool which has a slot to accommodate for the cable, or you can use an open ended wrench, and remove the heat shield like I did, and just replace it with the new one.
