P2098 code kicking out

Good morning,....I am new to the forums, but have owned 4 Aveos. My current Aveo is a 2008 Aveo 5
hatchback bought new in 2008. My check engine light came on recently and is showing a P 2098 code..
" Post Catalyst Fuel Trim System Too Lean Bank 1 " I have read that this can usually mean a vacuum
leak or a weak fuel system. I wondered if anyone on the forums has experienced this trouble code and
what the problem was ultimately found to be. My car is running fine....bit dont know if that is going to
continue. Any help would be greatly appreciated.....thanks so much and have a great day :-)