What will the warranty cover and what can i expect to pay out of my pocket for the repair work?

A/C inop at times, intermittently is cold, clutch always engaged, evac and recharged system to proper weight. pressures are even, I was told it has a variable compressor. How does the compressor know to work? Oh the car was in an accident in January, front end collusion. There are not any trouble codes at this time.

Are there multiple O2 sensors for my car? The troubleshooting area says it couple be:
oxygen sensor heater control circuit low bank 1
Probably cause, open or short circuit condition, poor electrical connection, or failed oxygen sensor efi relay fault