are all O2 sensors on 00 xj the same?

I searched, but didn't find an answer. I have an 02 sensor gone bad on my 00 xj. Question is whether they're all the same so that I can just order one without having to checking in detail about the part #?
Thanks

Always buy a high quality, brand name, OEM style sensor. There are a lot of "universal" no-name cheaper style sensors which are crap. You get what you pay for here.

As long as the application numbers match up for your year, the part number shouldn't matter to you.

Be sure though that you're specifying the right one when you order. The upstream one is before the catalytic converter. Downstream one is after the cat.

If you go check out rockauto.com, you will see numerous universal replacement O2 sensors as well as ones with specialized wire lengths. I would go with the Denso ones with the specialized wire length for each use. Or else plan to be tying up a lot of excess wire. You also need to know if you have the CA emission package or not. That is with the 2 pre-cats up close to the exhaust manifold.

2000 JEEP CHEROKEE 4.0L 242cid L6 FI (S) : Emission : Oxygen SensorPriceCoreTotal

DENSO Part # 2344077
Wire Length 12.99; # of Wires 4; Cylinder 4,5,6; O.E. Quality Replacement Sensor; Front$32.79$0.00$32.79

STANDARD MOTOR PRODUCTS Part # SG229T
{T-Series}
Upstream Sensor; Front$33.79$0.00$33.79STANDARD MOTOR PRODUCTS Part # SG209T
{T-Series}
Upstream Sensor; Rear$33.79$0.00$33.79STANDARD MOTOR PRODUCTS Part # SG300T
{T-Series}
Universal Upstream; Rear
Universal Downstream; Rear
Universal Downstream; Front
Universal Upstream; Front$37.79$0.00$37.79

STANDARD MOTOR PRODUCTS Part # SG268T
{T-Series}
Downstream Sensor; Rear$37.89$0.00$37.89

BOSCH Part # 13122
{OE Type - Exact Fit}
Upstream; w/ California emissions; Located in rear manifold / exhaust pipe; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles[$38.79$0.00$38.79

DENSO Part # 2344076
Wire Length 22.80; # of Wires 4; Cylinder 1,2,3; O.E. Quality Replacement Sensor; Front$39.79$0.00$39.79

DENSO Part # 2344078
Wire Length 13.82; # of Wires 4; Cylinder 4,5,6; O.E. Quality Replacement Sensor; Rear$41.79$0.00$41.79

STANDARD MOTOR PRODUCTS Part # SG300
Universal Upstream; Rear
Universal Downstream; Rear
Universal Downstream; Front
Universal Upstream; Front
$41.79$0.00$41.79

STANDARD MOTOR PRODUCTS Part # SG1815
Downstream Sensor; Rear
Upstream Sensor; Rear
Downstream Sensor; Front; Replacement Number$41.89$0.00$41.89

STANDARD MOTOR PRODUCTS Part # SG1816
Upstream Sensor; Front$42.79$0.00$42.79DENSO Part # 2344210
{Universal; OXYGEN SENSOR #5233088}
Wire Length 11.77; # of Wires 4; Cylinder 4,5,6; O.E. Quality Replacement Sensor; Front
Wire Length 11.77; # of Wires 4; Cylinder 1,2,3; O.E. Quality Replacement Sensor; Front
Wire Length 11.77; # of Wires 4; Cylinder 4,5,6; O.E. Quality Replacement Sensor; Rear
Wire Length 11.77; # of Wires 4; Cylinder 1,2,3; O.E. Quality Replacement Sensor; Rear$45.79$0.00$45.79

NTK Part # 23506
Pre-Catalyst; Exc. Calif.
Pre-Catalyst; Rear; Calif.$45.79$0.00$45.79

BOSCH Part # 15730
{OE SmartLink - Universal Fit}
Downstream; Except California emissions; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles
Downstream; w/ California emissions; Located in front manifold / exhaust pipe; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles
Downstream; w/ California emissions; Located in rear manifold / exhaust pipe; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles$48.79$0.00$48.79

BOSCH Part # 15729
{OE SmartLink - Universal Fit}
Upstream; w/ California emissions; Located in rear manifold / exhaust pipe; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles
Upstream; Except California emissions; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles
Upstream; w/ California emissions; Located in front manifold / exhaust pipe; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles$48.79$0.00$48.79

BOSCH Part # 13100
{OE Type - Exact Fit}
Upstream; Except California emissions; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles
Upstream; w/ California emissions; Located in front manifold / exhaust pipe; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles[$49.79$0.00$49.79

BOSCH Part # 13138
{OE Type - Exact Fit}
Downstream; Except California emissions; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles
Downstream; w/ California emissions; Located in rear manifold / exhaust pipe; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles$51.79$0.00$51.79

DELPHI Part # ES20044
Front; Cylinder 4$51.79$0.00$51.79

NTK Part # 23151
Pre-Catalyst; Front; Calif.$52.79$0.00$52.79

DELPHI Part # ES20047
Front; Cylinder 1$54.79$0.00$54.79

NTK Part # 23099
Post-Catalyst; Exc. Calif.
Post-Catalyst; Rear; Calif.$54.79$0.00$54.79

ACDELCO Part # 2131372
{#88929799}
SENSOR,HTD OXY(POSN 1) IN EXH MANIFOLD/CROSSOVER-CYL 4,5,6-4 WIRE-CALIF ESV
SENSOR,HTD OXY(POSN 1) IN EXH MANIFOLD/CROSSOVER-4 WIRE-EXC CALIF ESV[$57.79$0.00$57.79

DENSO Part # 2344008
Wire Length 10.71; # of Wires 4; Cylinder 1,2,3; O.E. Quality Replacement Sensor; Rear$57.79$0.00$57.79

BOSCH Part # 15465
{OE Type - Exact Fit}
Downstream; w/ California emissions; Located in front manifold / exhaust pipe; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles$60.79$0.00$60.79

ACDELCO Part # 2131375
{#88929802}
SENSOR,HTD OXY(POSN 1) IN EXH MANIFOLD/CROSSOVER-CYL 1,2,3-CALIF ESV-4 WIRE$75.79$0.00$75.79

ACDELCO Part # 2131373
{replaces 213-3918 #19145299, 2133918, 88929800}
SENSOR,HTD OXY(POSN 3) POST CONVERTER-CYL 4,5,6-CALIF ESV-4 WIRE
SENSOR,HTD OXY(POSN 3) POST CONVERTER-4 WIRE-EXC CALIF ESV
SENSOR,HTD OXY(POSN 3) POST CONVERTER-CYL 1,2,3-CALIF ESV-4 WIRE$84.79$0.00$84.79

STANDARD MOTOR PRODUCTS Part # SG728
Downstream Sensor; Front; Exhaust stock* Non-stock item--shipping delayed up to 2 business days$39.79$0.00$39.79

AIRTEX Part # 5S3234
* Non-stock item--shipping delayed up to 2 business days$68.99$0.00$68.99

NTK Part # 23110
Post-Catalyst; Front; Calif.* Non-stock item--shipping delayed up to 3 business days$82.79$0.00$82.79

Thanks for the info. Sorry if I wasn't specific enough. I guess what I meant to ask was, are O2 sensors like spark plugs, in that any one spark plug can go into any spark plug hole? From the above, it sounds like you need to find out which specific 02 sensor is bad, and then find the replacement for that one.

wolverine 00 xj said:

From the above, it sounds like you need to find out which specific 02 sensor is bad, and then find the replacement for that one.

Click to expand...

Correct. You have two oxygen sensors (or 4 for certain CA. models) One before the cat. converter and one after. They are likely to be different part numbers.

Lets go back to the beginning though to make sure you're not going down the wrong road. How do you know your oxygen sensor is bad? Is there a check engine light and associated code? If so, post the exact code number here for comment.

If you're going by symptoms, detail the symptoms here as well.

the CEL is on, and it is sending a code indicating a problem w/ an 02 sensor. I don't have the printout for the specific code on me right now, but I'll get it and post up.

They are different. If you have cali emissions you may be able to swap the up stream two with each other, but the wire lengths may be different. The upstream and sown stream have different plugs and won't swap with each other.

Maybe the '01's are different, but my '01 XJ and my cousin had an '01 XJ that were both bought at NJ dealerships brand new and BOTH have the precats and FOUR oxygen sensors. If you're going for the direct fit replacement sensors, you cannot swap the two upstream ones as they have very different wire lengths (6 inches vs. about 16 inches). I'm not sure about the downstream ones as I haven't changed those out yet.

Here are the brand names and part numbers I used for my two UPSTREAM O2 sensors on my '01 XJ:

Bosch 13100 - Upstream front manifold (long wire length)
Bosch 13122 - Upstream rear manifold (short wire length)

I don't know if there is a Federal emissions package on the 01s, they may just be Cali packages. However, my 2000, which was also purchased in NJ has the Cali package. Two precats, one main cat and 4 o2 sensors.

My 2000 has Fed emissions with one cat.

I have the CA emissions "option" on my '00 (also built for NJ per my dealer)... With 160K I understand that I should go ahead and replaced my O2 sensors as a preventive maintenance measure. Question is, can I just replace the 2 upstream sensors or do I need to swap out all 4?

Thanks.

gw204 said:

I have the CA emissions "option" on my '00 (also built for NJ per my dealer)... With 160K I understand that I should go ahead and replaced my O2 sensors as a preventive maintenance measure. Question is, can I just replace the 2 upstream sensors or do I need to swap out all 4?

Thanks.

Click to expand...

I asked the same question and the general consensus was to just replace the 2 upstream sensors and note any fuel mileage changes. Well, that is exactly what I did and I have put roughly 1,700 miles on the truck since. I've been getting roughly the same fuel mileage and the only time it increased was when I used a particular brand of gasoline - a Sunoco station by me that doesn't add ethanol to their gasoline (or at least they claim they don't). I can get 19.5-20MPG on the highway with it all day long, but if I get fuel from the local Lukoil or Shell, it drops to 17-18.

If I run across some extra funds, I may replace the downstream sensors just to see what happens. To be honest, I'd like to gut the two pre-cats and see what effect that has...

gw204 said:

I have the CA emissions "option" on my '00 (also built for NJ per my dealer)... With 160K I understand that I should go ahead and replaced my O2 sensors as a preventive maintenance measure. Question is, can I just replace the 2 upstream sensors or do I need to swap out all 4?

Thanks.

Click to expand...

You can just swap out the upstreams if they're the only ones that have failed. Thing is, it makes sense to just hit all of them at the same time; at least that way you know they're all good and when they were done. FWIW, I feel your pain on the Federal-spec 2001 setup. My '01 was CA-spec, bought in CA, and I hated that system.

Also, just to clear up why CA-spec XJs are being found delivered outside of CA when new: the term 'California emissions' doesn't apply to just California; there are other states that have mandated effectively the same controls as California. IIRC, back in the 2000-2001 timeframe that meant CA, NY, ME, NJ, and AZ. That number has since grown; even Quebec jumped on that boat last December.

[QUOTE

If I run across some extra funds, I may replace the downstream sensors just to see what happens. To be honest, I'd like to gut the two pre-cats and see what effect that has...[/QUOTE]

Don't the downstream O2 sensors only function to make sure that the cat system is still functional? I thought they had no effect at all on the Fuel trim, I think if you have them and did a cat removal you'd have the CEL on in a few seconds and have problems passing any type of plug in emmisions test.

multmigs said:

If I run across some extra funds, I may replace the downstream sensors just to see what happens. To be honest, I'd like to gut the two pre-cats and see what effect that has...

Click to expand...

Don't the downstream O2 sensors only function to make sure that the cat system is still functional? I thought they had no effect at all on the Fuel trim, I think if you have them and did a cat removal you'd have the CEL on in a few seconds and have problems passing any type of plug in emmisions test.

Click to expand...

Ah, I didn't even think about that. Yea, that would almost certainly set off the CEL if that's the intent of the downstream sensors. I just know that the precats are there to help remove HC from the exhaust stream while the main cat heats up. Since the precats are smaller and much closer to the outlet of the exhaust ports, they heat up much quicker and begin doing their job faster. I've removed them on other cars (specifically a twin turbo-charged car) and the performance increase, as well as fuel mileage increase, was very noticeable - I finally let the engine exhale!