This is Nissan Genuine part, Oxygen sendor for Maxima 2000 and 2001 model federal emission. I bought this from Mazda_Nissan part dealer with 108bucks+shipping, but it turned out my problem was from MAF. I changed MAF, and it seemed like my car is okay now, so I don't need this any more. I opened the package, but never installed this part. I sell this $100 including shipping, negotiable of course. Please, contact me through e-mail, sung.91@osu.edu. I am always in front of computer, so it might be the easy way. Thanks.