How Many 02 Sensors?

[gwjturner]

I have a 2005 sedan with the 3.4. It's coming up on 100,000 miles and I'm going to change the oxygen sensor(s). Does anyone know if there are 1 or 2?

[maxwedge]

2 I beleive, one in ft of the cat and one after, the one behind the cat should not need to be replaced.

[gwjturner]

Thanks Maxwedge. Is there something different about the one behind the catalytic converter so that it shouldn't need to be changed?

[maxwedge]

It just monitors the cat, has no performance effect.

[gwjturner]

Hey, thanks for the great info maxwedge.