[CREWZIN]

From PT Do-It-Yourself.net

You'll notice that there are a number of possible causes for this fault. If you have some experience with automotive repair you may be able to check a few of these possibilities out on your own, however keep in mind that the diagnostics are written for trained auto technicians who also posses the necessary test equipment.

Given that this is an intermittent issue it may be somewhat difficult to accurately diagnose unless you can duplicate the issue. The dealer will experience the same difficultly troubleshooting the issue unless they can reproduce the problem at will. Regrettably, you may have to wait for the component in question to fail before you can obtain an accurate diagnosis.

P2097-Down Stream Fuel System 1/2 Rich

Possible Causes

Good Trip Equal to Zero
Exhaust Leak
Engine Mechanical Problem
O2 Sensor
O2 Signal Circuit
O2 Return Circuit
Fuel Contamination

There's also a TSB (Technical Service Bulletin out for it.....

Date: 09/03/2004
Component Name: 110000 ELECTRICAL SYSTEM
NHTSA #: 1803604
SUMMARY: MALFUNCTION INDICATOR LAMP DIAGNOSTIC TROUBLE CODE P2097 P2099. *TT