H02 Sensor? - JeepForum.com
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post #1 of 3 Old 05-25-2007, 09:15 AM Thread Starter
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2001 TJ Wrangler 
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Location: Atlanta-Kennesaw
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H02 Sensor?

Ok, question for you all... Where the hell is the H02 Sensor located on a 2001 Jeep TJ. (This is not the same as the Oxygen Sensor on the exhaust)

Why I ask... (Background)

Short and sweet of it is I put in one of those Ebay Exhaust manifolds made for earlier TJ's and welded exhaust bungs in where they should be. {$100 beats $450) and everything works great. (Yea.. I got the Check Engine light because the guy that welded the bungs in, didnt do them where I asked) but a little simulator took care of that problem. When I ran the diagnostics with an ODBII Reader, it said that the H02 sensor was not ready.. and a month or so has gone by since I reset my codes, and passed emisions.. but this still says it is not ready.

Any thoughts?

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post #2 of 3 Old 05-25-2007, 10:45 AM
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1998 TJ Wrangler 
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Posts: 26,288
There is no such sensor.

Are you able to pull the codes, or is it giving you this not ready message before it even starts the scan process?

If you can pull the codes, what are the actual #s?
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post #3 of 3 Old 05-25-2007, 11:54 AM Thread Starter
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the guy at the emissions shop said two of my services werent running to pass inspection (because i reset the computer and had not driven long enough)
Those two were apparently EVAP and the H02 systems.. When I hooked up the ODBII it said those were the only two systems "not started"

After I hooked up the sims because it wouldnt pass emissions otherwise (getting the p4020 code) the EVAP system came up and everything was fine.. the guy said it would pass fine but one of the systems hasn't started yet.. when I looked at the ODBII scanner again.. the only one left to start was the H02 Sensors.

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