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Last Sunday I got a P0420 code. I got home and scanned the code and thought it meant the O2 sensor bank 1 was bad. So I bought a sensor (not yet installed) and cleared the code. Since then the code hasn’t came back on and car runs perfectly. I just got done looking the code up and watching Eric’s video about catalytic converter diagnosis, however, I don’t think that it is my cat. I say this because just a year ago I had a whole new exhaust (performance) put on that included a new cat and downstream O2 sensor. There are no exhaust leaks that I know of. However if there was it would be post cat as everything before then is welded, minus bolting the manifold to the block. Should I change the upstream O2 and see what happens?
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