2002 Dodge Ram 1500... Oxygen sensors???

There can be 4 of them, look and see. You will find one before and perhaps after the catalytic converter. If you have dual exhaust on both of them. As to the part number, just go to your favorite auto parts store and ask, they can look it up by make and model. Most of the time it's a separate number for the front and rear, and sometime for the left and right banks.

bank 2 refers to the number 2 cylinder bank. if your plug wires are numbered, this is easy, as 2, 4, and 6 are on bank 2. if they're not numbered, then the cylinder bank farthest rearward is bank 2. if you look closely, you'll see the cylinders are slightly offset, one bank is forward of the other. you'll want bank 2 farthest rearward. position 2 can mean one of 2 things. if you have an o2 sensor in an exhaust manifold, then position 2 is pre-cat, or the sensor directly in front of the cat. if there are no sensors in the manifold, you have position 1 in the pre-cat postion and sensor 2 is post cat, directly after the converter. be carful if you're diagnosing a post converter code, as sometimes this can mean the converter isn't doing it's job correctly and may need replaced. if it's a heater code, however, this more than likely means the o2 sensor is at fault. let me know if you have any more questions