1997 Plymouth Volare

Engine Performance problem
1997 Plymouth Volare 6 cyl Two Wheel Drive Automatic 100000 miles

recently performed diagnostic check and it indicated that an o2 sensor was bad theres also o black ring around the tail pipe.I need to know where exactly the b bank1 sensor 2 is located and how best to remove it a diagram woulld be perfect.I need to get this vehicle to pass smog can just cleaniing this sensor make it work properly again?Thank you for your time.
Michael caniano
June 23, 2010.

Bank 1 sensor 2
bank one is where cylinder #1
sensor 1 is before the cat.
Sensor 2 is after the cat.
What do you have for codes?

Jun 23, 2010.