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Unread 05-09-2004, 07:12 PM   #1
4x4 XJ
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CEL: o2 sensor going on and off, what gives?

My CEL came one and I took it to my mechanic to hook up his scanner. It came out as being the o2 sensor. He reset the ECU and called it a day and told me to bring it back if it came on. Well, yesterday we had HUGE storms and all streets were pretty flooded with 2ft of water everywhere. I did have to traverse some of it to get home and here and there, so, the CEL came on and off. Sometimes it would come out, I would hit some water, light went off. My catalytic converter was changed about 2 weeks ago due to it being clogged. This was a cheapo muffler shop new cat, so I think that might of affected it. Anyone have any info?

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Unread 05-09-2004, 07:29 PM   #2
Meerkat
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Quote:
Originally Posted by 4x4 XJ
My CEL came one and I took it to my mechanic to hook up his scanner. It came out as being the o2 sensor. He reset the ECU and called it a day and told me to bring it back if it came on. Well, yesterday we had HUGE storms and all streets were pretty flooded with 2ft of water everywhere. I did have to traverse some of it to get home and here and there, so, the CEL came on and off. Sometimes it would come out, I would hit some water, light went off. My catalytic converter was changed about 2 weeks ago due to it being clogged. This was a cheapo muffler shop new cat, so I think that might of affected it. Anyone have any info?

I would check the watertight integrety of the electrical connection first. Did you use dialectric grease inside the cap?
Next, make sure the wire isn't cut or loose.

HTH
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Unread 05-09-2004, 07:52 PM   #3
4x4 XJ
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I'll go ahead and check that. Thanks. Anyone else?
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Unread 05-10-2004, 01:04 PM   #4
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I was told that would happen if I placed the o2 at a greater distance from the first o2 on the exhaust manifold. I marked the position with a permanent marker on the floor board before taking off my old cat and used it as a guide line during placement of the new cat. No problems for my 02's.
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Unread 05-11-2004, 08:05 AM   #5
4x4 XJ
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Quote:
Originally Posted by 97RedBird
I was told that would happen if I placed the o2 at a greater distance from the first o2 on the exhaust manifold. I marked the position with a permanent marker on the floor board before taking off my old cat and used it as a guide line during placement of the new cat. No problems for my 02's.

So if the o2 sensor is placed too far away from the other, the CEL would come on? Hrmm...let me check that too then. Do you know the exact distance from one to the other?
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Unread 05-11-2004, 10:25 AM   #6
97RedBird
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I don't know how accurate it needs to be at all, and I don't know if the muffler shop I ordered my cat from was bs'ing me at all. I just know I installed the cat with a new 02 and haven't had any problems. I made sure I did follow the muffler shops direction as to placing the o2 closer or the same distance.

i can measure tonight and have it back in the morning. I'm worried about accuracy. I may measure from the tranny mount back, that way it will be a little easier to look at.
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