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Old 02-14-2014, 06:02 PM   #1
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Oxygen sensor issues

Hello, I am needing some help with my 97 tj. It has a four cylinder engine and recently I had a pace setter header installed. The shop that did it did not install the oxygen sensor and it was ruined when I picked it up. I put a new sensor in and everything was good for a bit then the check engine light came on. The codes read that the sensor was slow to respond. It would still run well but after a couple weeks the sensor would just stop working. I read about bosh plugs and switched out to another brand. It is running better but the check engine light is still coming on. Does anyone have any ideas. Thanks,

Edward

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Old 02-14-2014, 07:35 PM   #2
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What brand o2 sensor did you install?

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Old 02-14-2014, 07:46 PM   #3
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I put a NGK into it.
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Old 02-14-2014, 07:52 PM   #4
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And when the CEL comes on now it says the sensor is slow to respond? Did you replace both up and downstream or did you only have issue with the upstream?
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Old 02-14-2014, 08:25 PM   #5
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Just the upstream sensor.
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Old 02-16-2014, 06:06 PM   #6
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Bump
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Old 02-19-2014, 07:43 AM   #7
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Ufotestpilot, any idea what might be causing it ? Thanks,

Edward
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Old 02-19-2014, 07:50 AM   #8
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I don't bud. If I understand correctly, you installed just the upstream sensor, the CEL went away, but then it came back, it is the same CEL code as before, and the one thing that started all if it was installing a header. Is that accurate? I would pull the sensor and see if it is covered in sooty crap first, if it is I'd clean it and clear the code. I would think that either the sensor is getting fouled with crud by an engine that's not running properly, or there is an electrical issue with something related. I would think that timing or fuel management could be at the root, but you aren't getting any codes for that and it is running smooth right? Wish I could be of more help.

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