How to replace a catalytic converter on a 1997 honda civic ex

After 14 years I think it would be reasonable to have bad catalytic converter. Is there some reason your not accepting this?

Nope, catalytic converter wont do that

I don't think it is your catalytic converter because your light usually flashes and a bad cat I never heard of them causing a misfire. I ran your other code it is for a faulty EGR system. Exhaust gas recirculation excessive. You are getting too much exhaust gas back in the system. This will cause your misfire. Go-to a trusted mechanic and have them check out your EGR system.

that is the sensor that is behind the catalytic converter, it just measures effiicency of the cat itself-the sensor has a wire that pre-heats the sensor so that it goes 'on line' sooner, it has failed or is failing-the easiest thing to do is replace the O2 sensor, or you could ignore it until you have to go through emissions, and replace it a few days prior to inspection-but if you do that, and something else malfunctions that your check engine light would warn you about, you wouldn't know it-so it's probably just best to replace it when you can, in the near future. It will not affect at all how the car runs though.

I suggest that you not parts replace, but rather get is diagnosed. Each and every piece can cause failure. The numbers on the test sheet will give the first clues...
The parts are way too costly to take a shot at it...

You can have it reupostered

One is just above the catalytic converter the 2nd is just past the cat. on down pipe.

changing your cat. convert. is quite a project I recomend take your vehical to a muffler shop

replace it

start with the easy stuff. check the plugs. make sure they are not wet with oil leaking from the spark plug stem seals located on the rocker cover. Check your air filter to make sure its clean. Now for the slightly harder stuff. The spark plug wires should be changed every 80k or so. My suspect the reason for the power loss is most likely a clogged cat convert in the exhaust system. check your exhaust flow. Way to do that is to check the temp. of the exhaust before the cat and the temp. after the cat. If the Cat is plugged the temp before the catalytic converter will be abnormally higher than after the cat.

BUT if you are experiencing misfire of engine. I would go straight to replacing spark plugs and wires. Distributor cap and rotor.

Also check the charging system. make sure the alternator is charging the battery at above 13Volts. With all components on. ( radio/lights/highbeam/AC). Use a voltmeter and check at the battery positive and negative. if its not charging above 13 V replace the alternator.

good luck