Seeking the oe part number to the upstream and downstream o2 sensors on a 2000 4.0 xj I seen it before on the forum but can't find them now. advance list a hole bunch of oe I know there ntk but don't know the number thanks for your help

 

Look at rockauto.com

 

They list a few oe ntk numbers also :/

 

Try NTK.

http://www.ngksparkplugs.com/part_finder/car_truck_suv/

Fill in your vehicle info and it will take you to a list of O2S's that are designed for your Jeep. These are basically the same as you would get from the dealer. These are not OEM O2S part numbers but you can go to Rockauto and use the NTK numbers to find what you need.

 

They list 6 also

http://www.ngksparkplugs.com/part_fi...uv/results.asp

 

Right, but they are clearly labeled "Calif" and "exc Calif". Does your Jeep have California emissions? If not, that narrows it down to the two "exc Calif", Pre-cat (front) and Post-cat (rear).

 

true sorry about that wasn't even paying attention how do i tell i 4 o2 sensors two upstream one before cat 1 after.

 

You have to look at your exhaust system. The pics below show the Federal Emissions O2S ("exc Calif") and the California Emissions O2S("Calif") configurations.

 

so the federal has only 2 o2 sensors ?

i believe i have the cali then since i have 4 o2 sensors two in the cat two after..weird i live in pa

 

Yes you have a California emission car. A lot of '00 and '01 were made California compliant and not just ones sold in California. Mine is CA compliant and never been out of NC.

 

alright are the top two o2 sensors the same as each other.... and are the bottom the same ?


i called a local dealer he had no clue what he was talking about told me that there was three 02 sensors after i told him there was 4. still ignored me and then said about how it was going to cost around 300 for the lower .....

 

Refer to that NTK O2S chart again. It shows different part numbers for the different locations because of the O2S bulb design and different wiring pigtail lengths.

Forget the pukes at the dealer, get the sensors from Rockauto. Jot down the NTK part numbers from the website chart and look for them in the Rockauto catalog.

BTW - Why do you need new O2 Sensors?

 

Here I'll just do the work for you lol

NTK

upstream front 23151
upstream rear 23506

downstream front 23110
downstream rear 23099

 

Lol i figured it out. thanks for your time and ripping my head off. my brain dont want to work today. I think its dumb that all four are different.

Ccken I'm replacing them mileage is suffering 14mpg has a slight rough idle. Downstream are original 200000 miles. upstream one is at 200000 from my old blown motor other is from the motor I put in it.which is around 134000

 

Yep...they're due.