96 SL2 0133 O2 Sensor issue

You need to read the stored codes FIRST to see what the computer feels the problem is. Don't just start blindly replacing parts. Autozone will read the codes for no charge, but a Saturn dealer's diagnostic fee for doing so has ALWAYS been worth the money in my experience, since it often saves a person from replacing parts they don't have to.

Lane [ lane (at) evilplastic.com ]

Code is 133, so it should be the first sensor not doing very well.

So, how easy to replace it on Saturn? One shop gave quote for $250.