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It is illegal to remove a catalytic converter on any vehicle and carries a hefty fine if you are caught.
Your Converter Has Internal Melt-down. It Must Be Replaced.Your Car Could Catch On Fire.
The cost is $500 - $700.
Probably a restricted exhaust problem.I'd bet it's your catalytic converter.
400.00
If the converter is defective there is no alternative. You must replace it.
Replace the Downstream O2 sensor (after the catalytic converter)
"How much is the cost of the Catalytic converter on a 1997 Nissan truck?"
where is the catalytic converter located bank 2 for 97 Nissan altima
Under the hood, on the passenger-side of the firewall, down low & just above the catalytic converter.
Contact a Nissan dealership.
Any muffler shop can replace and cheaper than anywhere else