O2 sensors - JeepForum.com
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post #1 of 5 Old 09-20-2019, 03:53 PM Thread Starter
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O2 sensors

So I have a 99 XJ sport 4L straight 6. I went bogging last weekend and my girl drove it through a puddle we both thought it was a little shallower than what it really was lol so we sunk and water came up to the doors so obviously it went over the exhaust, I’m throwing 15 codes mainly O2 codes but also the IAC and a throttle body position code, so my thought is to replace the 02 sensors AFTER I did the injectors which I ASSUMED it was.. *******.. but a buddy said he’s done the sensors and there’s 4 two on the exhaust and two where you have to lift the motor to get to em, has anyone else heard of 4 sensors on these or was he just being over dramatic, because I’m only seeing the two.

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post #2 of 5 Old 09-25-2019, 03:12 AM
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2000 XJ Cherokee 
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Thinking he was dealing with an '00 or '01 with CA Emissions.
'00 or '01 with Federal Emissions only have 2.
A '99 with Federal Emissions should only have 2.
What I don't know is how many a CA Emissions '99 will have.
Poking around my '99 parts catalog and looking at O2 sensors on Napa online I am only seeing 2 sensors.
Upstream and Downstream
So I am thinking while it matters in '00's and '01's does not matter in '99's whether it is CA or Federal.
And you only have 2.
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post #3 of 5 Old 09-25-2019, 06:11 AM
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My '00 has two. Use NGK/NTK brand.
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post #4 of 5 Old 09-25-2019, 09:47 AM
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Are there some posts missing - date 9/20 and only reply is today?

sounds like a post that was replied to earlier? just nothing for 5 days seems odd?

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 #5 of 5 Old 09-25-2019, 11:33 AM Thread Starter
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I have two posts up about it so I’ve been responding to that one and not noticing this, sorry guys! I have noticed only the two, I bought the parts but I’ll be damned if they aren’t welded on they’re so rusted lol
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