Bank 1 sensor 1 is actually located in the rear manifold as the #1 cylinder is on the rear bank:
Easiest to access from underneath with the front end jacked up:
It has 4 -2 upstream on each manifold and 2 after the converters.
as long as the check engine light is being set by a O2 sensor fault code, it wont pass the emissions test, so it will need to be replaced before trying to go thru the emissions testing
go with the OEM. the problem with universal O2 sensors is that they arte designed to fit a multitude of makes, models, and engine sizes. Therefore they are not made to the exact tolerances as far as reading in millivolts as your engine requires and as a result, they generally fail within a few weeks of installation. It is worth the extra money not to have to worry about it failing on you in a few weeks and having to re-do the repair.