Hey everybody,
My dang check engine light is on again, and I got my hands on a code reader.

The code being read is "P0157 O2 sensor Bank 2, sensor 2".

Which side is this sensor on?, is there more than one on each side?, and specifically which one is it? Front or back? Also, what size of sensor would I need to replace it??

It is on a 2004 Ram with a 5.7 Hemi
Thanks for all the help.

 

Downstream sensor. As for what size, I would say about 2 inches long and 7/8 inch in diameter. It has a couple of wires hangin out of one side of it and it has threads on the other side and is a silvery color. Just tell the guy at the parts counter exactly what I have written here. He will know exactly what one Im talkin about...

Or you can get the exact part number you need from your dealer or at an auto parts store...

 

Bank 2 is the passenger side and it's after the cat like Alpheus said. Check for exhaust and intake leaks before replacing the o2 as well as the o2 harness (male and female) for damage...might save you some money.

 

Thanks guys,
Checked for exhaust leaks already, and checked the voltage on the 02 sensor and she's shot. Thanks for the help.