97 TJ O2 sensor problem - Jeep Wrangler Forum

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Old 11-28-2007, 08:02 PM   #1
Join Date: Sep 2007
Location: texas
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97 TJ O2 sensor problem

Hey ya'll,

Devils back in the TJ. I replaced the upper O2 sensor end of Sept. That solved my hitchin and bucking prob that occurred about 45 seconds after start. The symptoms for that bad sensor escalated to the point where the volt regulator needle would drop to zero, a beep would sound, and the check engine light would come on. I replaced the O2 sensor with a bosch from autozone, and all was well.

Well, the devil hitched a ride with me again, starting yesterday. She's doing the same thing. Start her up, she'll idle all day, but when I apply a load, then immediately "Beep, needle goes to zero, CEL comes on" and she hitches a bit. Fuel mileage is in the crapper, and the battery is dead.

I'm wondering about the durability of these Bosch upper O2 sensors. Could it be possible that the sensor is bad after 2 months? Or do I need to replace the rear after Cat O2 sensor? The rest of the jeep is fine. Up to tweo days ago all was well.

I'd replace the rear sensor, but on USAF pay (even nowadaze) if I don't need to I'd rather not.

Thanks for your expertise.
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Old 11-29-2007, 03:07 PM   #2
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how much did the upper sensor run you? i need to replace my lower O2. i also need to replace the whole manifold so i wonder if i did the O2 first, if it would have issues again from something up the line from it.

- Patrick
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Old 11-30-2007, 05:29 AM   #3
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Recently replaced my O2 sensr in my YJ, I did not have as bad of symptoms, but none the less they went away only to return a week later......... I crawled under tightened the O2 Sensor and All is Well again.

Must have not got it tight the 1st time, or like most things it's always good to go back a re-tighten.

Good luck.
'03 TJ Sport on 33's, 2"BB, 1"BL, 1"MML
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