dont our jeeps only have to sensors
the one coming off the downpipe which is upstream
and the one behind the cat which is downstream

 

I believe he meant 5 options. Yes, 2 O2 sensors.

 

So not the two near the manifold...?

 

The guy said I had 4 or 5 sensors total. Two on or near the manifold...

 

Regardless, upstream is above the cat. Mine only has two. I suppose emissions could be different from 99-2000.

 

So you are saying all of the upstream are the same?

 

there are basically four types of O2 sensors, heated and not heated, wideband and narrow band of each. On our jeeps, there are only two types available since they are all narrowband. IF you have 4, then the three before the cat are the same and the 1 after is different. ask him how many wires each has. If there is a difference, the ones with 3 wires are before the cat

 

Just go lay under it and see how many you have.

 

Yes, the PN is the same for the upstream sensor regardless of location.

 

Thank you I finally got an answer.

 

Plus that picture you posted is not for an inline 6 cylinder engine. We only have one exhaust manifold because the cylinders are in line, as opposed to two banks of 3 or 4 cylinders each (like on a Vx motor, like in the pic you posted).

 

That was the pic from the AutoZone site under our model

 

yeah mine only has two o2 sensors!!!!

 

My 2000 XJ is about to get all new O2 sensors. I have four of them, and 3 catalytic converters. The exhaust manifold is 2 pieces (one for cylinders 1 thru 3 and one for cylinders 4 thru 6) with its own precat. So, each manifold has 2 O2 sensors, one for before and after each cat. I'm about to replace all of them also and found them on amazon ranging from $30 to $50 a piece. They all had different part numbers, but the description indicated where each one went, i.e. front manifold upstream of the cat. If anyone else has bought these O2 sensors from amazon, please let me know if this is correct. Heres a link to the part search: .

 

Well that's just craziness then. The Liberty's might look like that, cause they got the minivan v6....but ours are inline, so that diagram is wrong.

My 2000 XJ has the 2 pre-cats just off the manifold, so I actually have 4 o2 sensors...one before each pre-cat (upstreams) and one after (the downstream).