05 mustang v6 ,,,isn't bank 2 sensor 2 on the drivers side? Got this code a month ago. . I have since changed out all 4 sensors and now the code is back. .. tried a Bosch sensor in that location and nothing, ,, read some where to use motocraft sensors instead so I just replaced it this weekend. .. and now it's back, ,, I do have a leaking heater core hose so I was thinking that may be having an effect on my sensor sound reasonable?