I am sure this has come up before and I am sorry if it has! I just got this car a couple weeks ago and knew about the code and know it is an 02 Sensor, but I am having a tough time finding out exactly which sensor it is (Oreilly's was even asking for the chassis number?). I see one before the cat and one after the cat. The one before the cat looks like it has been changed before and the one after the cat looks original. Looking for the barney explanation lol. Just don't wanna buy the wrong one as you know they aren't cheap.. Thanks!