2004 CTS 3.2L 5sp Man. 109,000mi. I had all the codes popping up for the 02 sensors. I replaced Bank 1 sensor 2, Bank 2 sensors 1&2. Now I have the p2099. Fuel trim rich.on bank 2. I've checked the wiring, vacuum lines and checked for leaking injectors and found nothing wrong. Am I looking at replacing the Cat on the drivers side? Any help would be appreciated.

 

This issue has been resolved. The LT side exhaust flange was leaking.