2000 Chevy Venture O2 sensor ?

Chris, O2 sensors are located on the exhaust pipes fairly close to the engine. As for which is bank 1, refer to a manual, I really can't remember. If you attempt to change it, you'll likely need a special socket that has a slot for the wire to hang out of. My Nissan ate O2 sensors but my Olds van like yours has 140k miles and hasn't needed any.

Scott

Bank 1 is the bank that contains cylinder #1, which in this case is the rear bank.

Thank You,, That is what I thought, but just was not sure

Thanks again

Chris