05 Honda civic catalytic converter replacement do I need new 02 sensors also?

I have a 2005 Honda civic vp I'm gonna replace the exhaust manifold -catalytic converter cuz its cracked the weird then is that it's been like that 4 2 or 3 week and I haven't get the check engine on i don't know if it's good or bad the thing is that if I have to change the 02 sensors also

Unless the sensors are bad, you should not have to replace them. Yo should be able to reuse them.

Just transfer the 02 sensors to the new exhaust system. Are you sure you can't just have a muffler shop weld the crack?