Does anyone know what I need to order for O2 sensors. I want to replace them. Do I need one for before cat and one for after cat? It does not specify on the parts web sites.

You shoudl only need to do the front one. Go here and input the info for your car.

http://www.rockauto.com/catalog/raframecatalog.php?

If you have other questions, just ask.

get AC Delco, NOT Bosch, this is VERY IMPORTANT!

thanks for the help.

Being an F-body owner and the horror stories of Bosch O2'* I would ONLY reccomend using the AC Delco/GM or Denso O2'* any not only the Bonne'* but any GM vehicle -- unless you want to chase DTC'* or replace them are more than 'regular' intervals... I think Harofreak and I can adapt the old saying 'You pays me now .. or pays me later' will hold true!

Changing it is not to hard. If you have a O2 socket, it will be easyer. If not, I think it'* a 15/16 open end wrench. Also, wear gloves when installing your new one. The anitseize will iritate your skin.

Should these be replaced after a recommended amount of miles? My car isn't showing any serious symptoms but I think my mileage could be better and I don't think its the plugs.

I think it'* like 40K to 50K miles.

Also you can go to Autozone and they'll let you rent there free, you have to give them like 10-20 bucks but you'll get your cash back when you return it, otherwise you just bought it lol...Also looking in I belive the General info thread they give a discount price from that site, I'm going be ordering my rear in 5 mins..

Andrew the one that says DENSO Part# 2344018 the one I would need for the rear one by the cat?
http://www.rockauto.com/catalog/raframecatalog.php?

oops doesn't send you right were you need to be, but if you look under the 01 non */c