bank 2 is the drivers side, and upstream is the 02 sensor before the cat.
Good luck with the repair! It's usually the sensor itself but it could be the wiring or connector..
__________________ 1992 Mustang LX hatchback.. 1 of 542 black on black 2003 Regal GS - the beater/daily driver - somewhat stock. No its not a mustang, at least it's blown.
Do You Know The Code Sometimes If Bank One Runs Leaner Than Bank Two You Could Have Carbon Built Up In Your Egr Valve Take It Off Get Some Throttle Body Cleaner Or Seafoam Or Something Clean It Up Really Good Spray All Lines There Should Be Two Wires Connect To Bottom Of The Egr Valve Make Sure There Hooked Up.