Hi guys, help needed from u.

I got an Elantra and no more warranty le as I Accidentally skipped one service, then now my engine light keep on appearing after erased for several times, (Scan result P2096 fuel too lean something). So, I went to different sc n got different feedback. One said it is the catalytic converter faulty, another said fuel issue n asked me to change from shell to others brand instead. Faint..

Thus, should I change the converter or?

Many many thanks