Good explanation of the code(s) here:
http://www.camaro5.com/forums/showthread.php?t=102750
The meat of it:
DTC P2097
Post Catalyst Fuel Trim System High Limit Bank 1
Conditions for Setting the DTC
The rich correction limit for a condition causing a lean air/fuel ratio has been exceeded for greater than 4 seconds or for a cumulative of 30 seconds.
Diagnostic Aids
An HO2S will not cause this DTC to set without the occurrence of circuit related HO2S DTCs. Do not replace an HO2S to address this DTC.
An exhaust system leak that may not be audible can set this DTC