Hey I got a CEL today and got it checked at Advance Auto. The reader showed it was an o2 sensor. Bank 1 Sensor 2 high volts. Is this the one before or after the cat? Does this merely mean the cat is bad or do I have other problems like clogged cat, etc.....

 

Should be your pre cat sensor. If your cat was clogged, you would know, because it would cause your engine to misfire in most cases. Also, it would rattle like a bunch of bolts are loose. Specifically, what code did it throw?

 

that will be the sensor after cat
if the code said high vltage i would do the sensor first

 

1+ the bank 1 sensor 2, would be post cat. Nothing major to worry about, just an annoying light that will show up on your dash.