P2000 Code

My check engine light is on and I am getting a P2000 code with my scanner. I cleared the code to see if it would come back, it did. Checked the service manual but no P2000 listed. I searched this forum and nothing relevant comes back. I googled the code and noticed some dodge cummins guys getting the code and changing their upstream O2 sensor bank 1. I pulled the upstream O2 sensor and tested it....it was bad, also discovered a small exhaust leak right behind the O2 I changed where the pipe meets the Cat. I fixed that too.

My question is have any of you had this code? If so, what was the fix? Thanks!

John