o2 sensor
 

I have a check engine light on and used my scaner to read the code
and it gave me a reading of sensor 2, bank 2 is where the problem is at.
my question is where is that located the dealer calls them left front, rear front,right front, right rear

Which car?

My guess would be right rear, but what car?

O2 sensor
 

O2 sensors can be found on the exhaust before the cat and some newer cars have 2 of them before and after the cat. Some cars can have up to 4 O2 sensors if they have dual cats. Just look under car follow pipe and you will see it on top usually it has a cover or some type of sheilding on it.

If you would give car type it would be easier to give you more specific info.

Anthony Bridges