Acura CEL p0420 on 1998 Acura Integra

Shield came off underside of catalytic convertor and I still have the part. Would have to hose clamp part back together since mounting screws corroded and fell off. Would that work, or does the convertor need to be replaced? Also, how would I know if its the rear O2 sensor instead of convertor?

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1 answer
Leaded fuel was used where unleaded was called for
An oxygen sensor is not reading (functioning) properly
The engine coolant temperature sensor is not working properly
Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
Retarded spark timing
The oxygen sensors in front and behind the converter are reporting too similar of readings

All possible causes of a P0420 code. Run diagnostics yet? Is 0420 the only TC showing? If there's another code in the system then that's a big piece to your puzzle. It should help narrow it down. If not .. I'd go have a professional look at it.