CEL code explaination needed

[BoxsterSenior]

This past week I changed my MY98 single tip muffler for a MY00 dual tip muffler (used). I removed the exhaust system at the flanged header joints, so the cats and 02 sensors came off with the muffler. Disassembled the single tip muffler and installed the dual tip muffler, then reinstalled the complete assembly.
After driving a few miles the CEL came on. I plugged in my Durametric and got the following codes……
P0154 Porsche fault code 18 – 02 sensor ahead of cat. conv. bank2
P1130 Porsche fault code 361 – Oxygen sensing adaptation idle range bank 2 exceeds limit value

Question: Are these codes indicating one of my pre cat 02 sensors have failed?
And is bank 2 the right (1-3-5) or left (2-4-6) side of the engine?

Any other information would be appreciated.

Thanks in advance.