anthony yordi

Hey guys I'm back haven't posted for a while. I just got my motor Replaced on my 07 C230 Sport 2.5L V6. Long story short I blew a cylinder on my previous motor. The new used engine (66K Miles) is already giving me check engine lights for the O2 sensors as as well as misfire 2 cylinders. My mechanic said as I was driving away with it, it may misfire a little bit due to the fact that my O2 sensors are fried has convinced me that once I get the o2 sensors and cats installed that my car will run right. I'm aware that my O2 sensors are fried do you guys think that could really be the cause of the issue on a new used motor that was just installed!! I would appreciate any feedback or advice you guys could provide.
These are my check engine codes
P0300
P2414
P0303
P0302
P0171
P2A00