Upstream o2 sensor connectors? - JeepForum.com
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post #1 of 17 Old 04-12-2019, 12:53 PM Thread Starter
Pacsur
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(Only 1?) Upstream o2 sensor?

2000 Jeep Tj, Iíve been getting around 10 miles a gallon last 6 months, used to get 12-14, mainly stop and go trips 5-10 miles. I show no codes, tailpipe black and running rich, injectors cleaned, new thermostat as old one was 185 and changed to 195, oil change, air filter, and plugs also.
Was going to install new upstream sensors today, both ports are plugged with bolts and we cannot find where the new sensors would plug in to?
Any advice on where I should be looking for them or where does the other side starts from?

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Last edited by Pacsur; 04-12-2019 at 12:58 PM. Reason: Add photos
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post #2 of 17 Old 04-12-2019, 01:14 PM
ZEN357
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I think you are on the right track. Definitely sounds like 02 sensor problems. Same thing happened to me with a car I once owned. 02 sensor went bad and I literally went through a tank of gas in one day driving only about 50 miles.
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post #3 of 17 Old 04-12-2019, 02:53 PM
Jonny Jeep
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Those 'bolts' will be O2 sensor bung plugs, and are where your upstream O2 sensors should be located. I think the connectors for the O2 sensors might be at either end of the fuel rail wiring, a black plug at the front and a grey plug at the rear. I'm not familiar with the later models though so somebody else would have to confirm the location. I have no idea why you are not getting codes either with both upstream O2 sensors missing.
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post #4 of 17 Old 04-12-2019, 03:11 PM
biffgnar
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Not sure about an 00, but with later models the plugs up by the fuel rail are idiot proof by being different shape. If you order the right part # it will only plug in one spot.
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post #5 of 17 Old 04-13-2019, 09:53 AM Thread Starter
Pacsur
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Ok, I just went thru the engine compartment and do not see any open plugs for o2 sensors at the end of the fuel rail or anywhere else. I also went online looking at photos and I do not have the 2 small catalytic converters coming off my manifold, guessing thatís why the sensor ports are plugged, as I follow my exhaust down it runs to the passenger side and right before my skid plate there is 1 sensor, and then the single catalytic converter and then 1 sensor after it on other side of skid plate, so now I need to know what is the upstream sensor number I should use as a replacement? Thanks for all your help.
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post #6 of 17 Old 04-13-2019, 10:32 AM Thread Starter
Pacsur
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After searching for more info it seems I need to use the 2 1999 o2 sensors, 1 upstream #23151 and 1 downstream #23099, can anybody verify this for my 2000 Tj?
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post #7 of 17 Old 04-13-2019, 11:23 AM
jtec
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lots going on here - look at the emissions decal on radiator support, are we looking at a FEDERAL or California emissions vehicle.

Those do look like o2 sensor bungs but no mini cats are there - looks like diagram is what we have here --- post the code numbers and time permitting I will get manual opened..
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When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #8 of 17 Old 04-13-2019, 12:05 PM Thread Starter
Pacsur
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Tag is unreadable, but I looked up my build sheet and it says U.S. specifications label, sold and shipped to Washington state.
If you take out the twin mini cats that is basically my set up in diagram.
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post #9 of 17 Old 04-13-2019, 12:52 PM
jtec
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I do not know if washington state used California emissions - many times dealers will have the enhanced version as it can be sold in both states.

You are changing sensors why- maybe a code will help settle this - if its a code for enhanced California set up we have the answer.

FYI: the OEM manual is somewhat unclear but will look again.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #10 of 17 Old 04-13-2019, 01:12 PM
jtec
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see if this is your o2 pre cat sensor location.
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When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #11 of 17 Old 04-13-2019, 01:50 PM Thread Starter
Pacsur
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Yes, the last photo with the single pre cat sensor is what mine looks like.
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post #12 of 17 Old 04-13-2019, 02:20 PM
jtec
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talk about hard to find info - anyway we got the correct set up, you have the precat o2 sensr location.

Why are you changing the sensors?
What codes are showing?

I am understanding of the SOP of R&Ring at high mileage but I am not sure it will be the cure for the bad MPG.. is there a code we can work from?

Running Rich - things to ck, ECT, Leaking fuel injector?, exhaust leak, duh air filter had to mention, Misfires, fouled plugs compounding issue, engine condition blowby PCV VALVE SEALS.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #13 of 17 Old 04-13-2019, 02:21 PM
jtec
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Bad post

vEHICLES i AM OK
COMputers not my thing.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #14 of 17 Old 04-13-2019, 02:42 PM Thread Starter
Pacsur
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No codes, newer remanfactured engine, runs good, gas mileage sucks, o2 sensors are last thing on my list of things to replace, have read numerous message boards, also have new speedo gear making sure my mileage is accurate.
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post #15 of 17 Old 04-13-2019, 03:07 PM
jtec
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Ask local law enforcement for a hand - as you drive by a radar gun at 35 - ask what the officer saw on radar gun... the guys here are great and will do.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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