I have to replace the ignition coil in #4 cylinder in my rsx-s, I was wondering if that is the one all the way to the left when standing in front of the car (driver side) or the other?

I also have to replace the O2 sensor in the first bank is what the code said. Is this the first O2 sensor before the catalyst? I just want to make sure because its like a $100 dollar difference.

Thanks for any help you have to offer.