I have an 04 Ram 1500 V6 that keeps pulling the code P0038, Bank 1 sensor 2. About a month ago it pulled that code and I changed it, it also pulled the code for Bank 1 sensor 1 either 20 miles before or after (I can't remember which). I switched them both out and it ran about 1000 miles and pulled P0038 again which makes me think it may not have been the sensor. Any thoughts?

 

Could be the Cat, could be an air leak, possibly around the exhaust manifold bolts...