Codes:
P0134
P0135
P1631

The car runs like normal, and my 02 readings are about 650 at idle and move all around when I cruise. I recently had headers installed w/out a cat. Could this be the reason why I have these codes? Should I send out my PCM to have the 02 codes disabled? I saw that the 1st two codes deal w/ the 02's but not sure what the 3rd code is.

Forgot to mention my SES light is on as well.