If a code tells you it's an o2 sensor. What else could be the problem

These codes are for misfiring and mass air flow faults. I don't think an 02 will fix it. You can start by searching for a vacuum leak, cleaning your mass air flow sensor, checking spark plugs and fuel pressure. Basically you need to start with the basics. If you don't work on your own car then use this link to find a good shop near you. https://repairpal.com/repair-shops Alex