So I have a 2000 Civic EX coupe, and a few months ago I had a check engine light, took it to advanced auto parts and got scan on it, and it was a bad oxygen sensor. So the guy reset the code so the light went away, well I'm planning on replacing it this weekend, but I want to verify it's still bad since the light hasn't come on since. One thing that's for sure is that it's never been replaced any my car has 129K miles on it, and the other thing I notice and it guzzles gas in the past year or so. And the final thing I notice about my car in the past few months is that it runs really choppy or idles very low about 500 rpms when at a stop light. So i'm pretty sure that it all points to a bad Cat or O2 sensor, but does anyone know what this could be? Thanks any help is appreciated.
Guys he said the code came up originally, when they reset the code, it is just masking the problem, sometimes parts fail without codes, when the cel comes on typically it is when the part is way out of spec. MAP sensors and O2 sensors can get out of spec and not set off CEL's.
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