2005, 2500HD, 6.0. Check Eng Light on. Codes read P-0060 and P-0161. Both of these have something with o2 sensors. Can anybody tell where these two sensors are located and are they hard to replace; Thanks

 

Here is an image to help you. The first sensor is in the exhaust pipe near the manifold, the 2nd sensor is is behind the what appears to be the catalytic convertor. Sorry I don't have a truck that new so I did a little bit of Google for you.

 

Thanks x2 That diagram did it for me.