hello i have a 1997 ford f 150 with a 4.2 ltr v6 the check engine light came on so i took it to autozone and had the code pulled. They told me that the o2 sensor bank2 sensor 1 which is before the converter had a slow response so i checked the wiring and bought the o2 sensor. Theytold me bank 2 is the passenger side but well i changed the1st sensor on the passenger side and reset the code and drove the truck about 130 miles . and the light came back on. After reading a few posts. I think they told me wrong is the drivers side bank 2 or is the passenger side bank 2 I have a feeling if I continue to listen to autozone that im going to end up replacing all 4 at 60 bucks each any help with this problem would be greatly apreciated thanks in advance