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I'm glad I came upon this thread, I have a 98 civic ex and I'm in a similar situation that you're in. I unplugged and replugged the o2 sensor and ran the car and got a p0420. I took off the heat shield to find the exhaust manifold cracked.
I'm thinking of going to a pick and pull and getting a replacement manifold and o2 sensor but I'm not sure if that's going to work. Maybe if yours is cracked you could try that and save some $$$
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