Is there anything I should know before changing the O2 sensor on a 99 Pontiac...

[moralorel79]

...Grand Am? I see that there are two. It may sound foolish, but I was just wondering if there was anything I needed to know before replacing them. I've found that nothing seems easy to fix on Grand Ams. As it is, it took about ten four letter words to get the head lights in correctly (and that should be easy).
Thanks for any advice before I put these in.

 

[chalmersvince]

special socket

 

[Zimgxp]

Usually the rear one is fine. If you don't have a socket, a 7/8 wrench will work if there is room. Do not use thread sealer, it will insulate it from ground.