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Unread 01-18-2011, 02:19 PM   #1
nerdkiller
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O2 sensor fail (P0161) Where is sensor?

I have the reading from autozone. Here's the following:

aa1 - Oxygen sensor defective
aa2 - Pooor connection at Oxygen sensor
aa3 - Check circuit-fuse


For a non technical person how can I determine the solution. I already reset the CEL and it came back a few hours later. I found this fuse diagram: http://www.lunghd.com/Tech_Articles/...tification.htm

But not sure which is which.

Aside from checking the fuse where do I check the O2 connection?

I assume if those 2 dont solve it then the sensor itself is defective.

I'm still within the used car warranty but don't want to drive an hour or more just to have someone else change a fuse or jiggle a connection.

thanks all,

Nick

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Unread 01-18-2011, 02:22 PM   #2
carguy68ssrs
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If it falls under warranty any Jeep dealer should fix it
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Unread 01-18-2011, 02:37 PM   #3
nerdkiller
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Look's like sensor #2 based on the AZ print out. See the attached scan.
scan0029.jpg  
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Unread 01-18-2011, 03:11 PM   #4
nerdkiller
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Didn't buy it from a jeep dealer. It just falls under the New York State 30 day used car return warranty. If the place was nearby I'd go over there and let them check, but with average traffic it's over 2 hours roundtrip on a week day.

Should be a simple fix, or at least easy to rule out the fuse and the o2 connection right? Long as I know where to look?
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Unread 01-18-2011, 03:45 PM   #5
Holder350
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Knowing what year XJ we are working on would be helpful.....but the fact that it is OBD2 tells me its probably above a 97.....I'm going to guess 99

The O2 sensor fuse is in the PDC....and it is fuse #24

The upstream and downstream heaters are both controlled by that fuse, so I doubt its bad....but it never hurts to check.
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Unread 01-18-2011, 04:30 PM   #6
nerdkiller
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[QUOTE=Holder350;10809118]Knowing what year XJ we are working on would be helpful.

It's a 2000 w/ 94k miles. Thanks, I'll check fuse. first.!
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