Hey I'm new here.. well to posting at least. I've been reading the forums here for a while, and they've helped me out alot with my car. But now I have a problem that I'm not real sure about. I have a 1997 Taurus GL, and my check engine light is on, with the code p0420 Catalyst Efficiency Below Threshold(Bank 1). I don't know much at all about the exhaust system or the catalytic converter. What is the best way to determine if its just an o2 sensor, or if it IS the catalytic converter? Also if it is the cat, does it hurt it too bad to keep driving it? One last thing, would it be cheaper to just buy a new exhaust system than to replace the cat(are there 2 or 3?). Any help would be great! Thanks!
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