How do I know which O2's to get?

[jenbaker]

Okay, my father in law and husband are changing the O2's next week. Now, how do I figure out which ones to buy? On the write up that Ford gave me, it just says:

Upstream O2
R&R both lack switch

When I look at Schucks.com it doesn't say anything about "upstream", just rear, left exhaust etc.

 

[Runnin'OnEmpty]

Jen, bank 1 is the passenger side, bank 2 is driver's side. The upstream sensors referrs to the ones closest to the exhaust manifold; downstream are the ones after the catalytic converters.

Therefore the ones you want are the "front" (upstream) left and right (bank 1 & 2).

 

[JMoore]

At the parts store they are all the same! An o2 sensor is an o2 sensor nothing changes front or back.

 

[Nick C.]

they'll need to know if you need long wire or short wire. That's what they asked me anyway for my 96. I don't know the answer though.