I have a 2004 5.7 4x4 Ram. Was throwing all kinds of O2 sensor codes. With over 100,000 I decided to change all 4. Now I still have a P0157, which is bank 2, sensor 2. Just not sure where to go from here. Is it possible I got a bad sensor?? Or do I have a faulty wire that I have to search for? Thanks in advance.

 

http://www.obd-codes.com/p0157

Try checking the o2 sensor harness.

The code is for engine running lean but you didn't speak of any other issues you were having while this code was present.