I had code P2098, Bank 2 post catalytic too lean, a few years back. (Same as your 2096, but bank 2 vice 1) It was caused by a split weld seam on the forward catalytic converter. The split seam could not be seen from under the car, but I found it by moving a short length of garden hose along the pipe while it was running and listening through the hose as I moved it from the exhaust manifold down the pipe. I removed the pipe with the converter, welded the split seam and it has been fine since then.

P.S. I looked at your astronomy home page. VERY NICE. I too enjoy astronomy. It was my hobby as a young boy which I developed into a career as a ships navigator. I spent 20 years at sea. My wife and I drove a few hundred miles to the north of our home and did see the Aug 21, eclipse in totality. You are much more advanced than I in astronomy as I have given that hobby up, but stay busy with my Crossfire. WELCOME TO THE CROSSFIRE FORUM!