This is what I found. It could be an Oxygen sensor. Since it goes out from time to time I wonder if bad gas could cause the code? Run what's in the tank lout and fill up with premium (name brand, just in case) to see if the gas makes a difference.

Les

P2098=Post Catalyst Fuel Trim System Too Lean (Bank 2)
P2096 Post Catalytic Fuel Trim Bank 1 System Too Lean