rtralabama

huh. i do not have on there. i just have one near my exhaust manifold and oil panel.

DaddyCat

As we said, sounds like someone replaced your cat with one without an o2 sensor. A muffler shop might be able to weld in a threaded bung to accept an o2 sensor.

rtralabama

yeah i gotta see if i can find the wires first. if i do i could drill hole to fit o2 sensor and then weld a nut on top.

DaddyCat

Maybe, if you have a nut with the right threads. Of course you need to drill a hole in the post cat tube (I know you knew that). I would think a muffler shop could sell you the correct threaded bung.

rtralabama

yeah, lets just hope i can find the wires, or else idk what im going to do.

rtralabama

so i was looking more under the jeep by the one o2 sensor i could find, and i find 2 more! lol. so now i have 3 o2 sensors but not one past the cat.

DaddyCat

I found this thread, I think it should help. All 4 o2 sensors are near the engine!
https://www.cherokeeforum.com/f2/o2-...sor-2-a-41090/

rtralabama

alright thanks!

bruinz

For those struggling to get wrench access to the downstream front O2 sensor (1/2 O2S) on a 2001 XJ, this little $10 tool from Kragen-O'Reilly made quick work of it:

P/N: W84008 (Offset O2 Sensor Socket)

After struggling to get a wrench on the O2 sensor for almost 90 minutes, this thing made quick work of it. I was done in 5 minutes!!!

Hope this helps someone.

More later...

Z.

crystalion

This is the set I have


You can also BORROW for up to 3 months - 90 days ( 25.00 deposit) the same set from Autozone.. After 3 months they keep the $25 and the set is yours..

askingxforxit

I also have a cat without an o2 sensor. That doesn't really concern me. I'm more interested in the o2 sensor(s) that I should replace before they go bad and affect my gas mileage. I bought an o1 sensor from napa today for undertone of the cat. The guy didn't ask me if I needed two.

So do I need to replace the two in the banks our the two below the banks?

Edit: and are all the o2 sensors before the cat share the same part number?

xj_maniac_newb

if i only have one, whats this doing to my jeep? i only have one on my 4 banger with no engine light

askingxforxit

Anyone???

askingxforxit

Sorry for the typos.

askingxforxit

Bump