Quote Originally Posted by Slick2500 View Post
This statement is only partly true. 97-00 don't need a rear o2 sensor, 01+ need an o2 sensor or the cat diagnostic test gets stuck on and the car will dump fuel. http://www.grandprixforums.net/threa...ou-should-know
Guess that's what I get for having four W-bodies, the newest of which is 2000.