Hi guys im trying to solve my bad running problems and faultreader has pointed to o2 sensors,i havent taken them out yet but i need to know if anyone can tell me exactly what size and type i need,its a 2001 4.0 xj classic,here in the UK its tough to get jeep parts due to not many dealers,iv seen items on ebay but they appear to be different sizes,so would be a happy bunny if one of the Jeep Gods could give me some info on what to buy.....

 

I would say Rockauto.com and I believe they ship to the UK.

In 2001 NTK was the OEM O2 sensor maker.

 

I believe NTK o2's were used from the factory. Rockauto probably has them but you'll have to find out which o2('s) are bad, i.e. upstream or downstream and which bank they're on.

 

Am i right in assuming guys there are two sensors,one before the cat, and one after? dealer said he thinks there are five?? wtf sure he must be looking at a spaceship fiche on his viewer...

 

Is there an emissions decal on the upper radiator support, what does it say? Why don't you slide under it and have a look?

 

Hey mate , don`t know if they are the same but I just went through this with my daughters 98 t.j., It was running like garbage sputtering almost like it wanted to stall but wouldn`t and then it would clear up, and no cel..and be ok untill you let the clutch out and same thing again., Anyway I decided it was the 02 sensors and started searching for the best price and part after some research I decided to go with denso exact replacements . The jeep only had two one right by the exhaust manifold (upstream) and the downstream was by the cat converter.. I got the best price from amazon.com and shipping was free.. I believe the total was $72.00 for the two of them.. Installed them and truck is running perfect!! don`t know if it helps but that is where I found the best price.. Cheers!! and good luck.. Seven

 

well it is dark here (Long Island, New York) but I just looked under my 2001 cherokee sport 4.0 and I can only find two and they are by the exhaust manifold close to the intake?/ It looks like they are before and after the cats. Anyway I looked up parts and at advanced auto the oem replacement by ntk part # 23506 that sells for $59.99 amazon.com same part and part # is $26.92 that is the upstream sensor. The other part # they list is for the downstream sensor and that is part #23099 ntk advanced auto price is $66.99 amazon.com is $ 36.75.. This is why I was shopping hope this gives you a little more information I am going to check again tom to see if their is a third or fourth sensor I only found two , but it is dark eye`s are getting old lol!! and truck does not have a lift it is my daily driver good luck Bill

 

Does the image below illustrate your exhaust system? If so, the Oxygen Sensor part numbers are listed. Or do you have the single exhaust pipe system without the dual mini-cats? If so you only need part number 23151 for the upstream/pre-cat position, and part number 23099 for the downstream post-cat position.

 

Ken I said it before you are the man!! I guess that is why I can only find two on mine lol11 New York version I guess.. I only see them on the pipe after the cats.. Once again Thanks, great illustration as they say a picture is worth a thousand words!!

 

Chances are you need ALL sensors. RockAuto is very reasonably priced. The sensors really do have a limited lifetime as they wear out and get gunked up. The PCM actually uses all sensors in setting the fuel mix, so for best performance and efficiency all should be up to snuff.

2000 still had the "Federal" old-style emissions, I've noticed that almost all 2001 are the California type.

 

Thanks guys,Ken i dont have that setup,mine is single pipe and sounds exactly like Sevens,looking at it i have one just down from the manifold and one further along. so sevens part numbers hopefully should locate me my sensors.

 

The 2000 model year came with dual mini-cats for California emissions and without the dual mini-cats for Federal emissions. For the 2001 model year, dual mini-cats where installed on all XJ's (4.0 L), called 50 States emissions.

The 2000 Federal exhaust manifold had the split dual runner configuration but no mini-cats.

I think all 2000 XJ's for Europe export had no mini-cats.

 

Yeah - I should have written "had the Federal Emissions as an option"

 

Hi guys been trying all day to find my two o2 sensors...jeez rare as hens teeth here in UK jeep dealer wants £150 sterling per sensor and no stock,europarts dealer doesnt stock any to fit or they have a universal one that involves rewiring,cant find any on Amazon here so if anyone can send me a link or make a suggestion id be a happy guy....

 

Check rockauto.com. I believe they ship to the UK.