Hi my check engine lite is on. On my 2002 2.7 so I am changing oxygen sensor Lift side before Cat and right side before car. I was told something about Bank 2 was bad? any how is lift side sensor, is it the one right in front of car?? Or in the back by fire wall?[/align]

 

Don't just change parts. Have the computer scanned first to see what the code is that is making the CEL come on.