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Q: codes on 1999 Chevrolet Corvette

PO141,PO161 PO171,PO174
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P0141 refers to the bank1, sensor 1 heater circuit.
P0161 refers to the bank2, sensor 1 heater circuit.
P0171 bank 1 system too lean.
P0174 bank 2 system too lean.
Get the system checked out by a Corvette or GM specialist. I doubt that all 4 oxygen sensors failed unless there's excessive oil or coolant in the exhaust stream.
If you want to find a specialist, here's a directory link for you:
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