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Discussion Starter · #1 ·
The Jeep in question is a 1997 TJ, 4-banger. Rough running and wants to shut off when it's cold and you hit the gas pedal.

I've already done a tune-up and that helped some, but at 92000 miles I think it probably needs an oxygen sensor.

The problem is that it has 2, and at $70/each, I don't want to replace both unless I need to.

So, which one would be the 'primary' sensor - before or after the catalytic converter? I'm thinking it would be the one in front, but I really don't know. Which one is more likely to control the 'cold engine' mixture?

Thanks!
 

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It's a '97, get the diag codes with the key on/off sequence and see what the problem is.
 

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Discussion Starter · #3 ·
No codes come up. I'm just thinking it's time for a new O2 sensor and I want to put it in the right spot to begin with.
 

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Yeah it sucks but its sorta like the dual battery setup. replace both so that you get accurate readings. If they are both off then the computer gets bad info but if the front O2 says one thing and the second sensor says its way out <IMG SRC="smilies/eek.gif" border="0"> Just do both and be done with it.

[ 10-23-2001: Message edited by: The Rockslut ]
 

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I would not waste your money on the O2 sensors. They either work or they don't. If they are not throwing codes then they are fine. I would spend $50 and have the dealer or a shop hook it up to a diagnostic computer to check for problems. It will be less expensive in the long run and you will not be chasing you tail trying to find the problem.
 

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Take it to the dealer have them hook it up and charge you an hour for them to tell you it needs 2 O2 sensors before they can go any farther. Sounds good to me. <IMG SRC="smilies/rolleyes.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0">
 

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Take it to the Dealer??? What! If you going to keep the truck get a scanner! For 120.00 you can get a OBDII scanner software and shoot your own codes. Use it two times and it's paid for! You can even keep it hooked up and look at things in real time. Most PDA's/old laptops can run the software!

Replace the frt O2 sensor, the rear one is just there trigger the cat falter code. Be happy there only 70.00 my daily driver has 4 O2 sensors and there 350.00 EA! $1400.00 worth of sensors

Here is what I use: http://www.obd-2.com

[ 10-23-2001: Message edited by: Old Scout ]
 

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02 sensors should be replaced every 50,000 miles this is according to bosh so at close to 100,000 miles it would be a wise investment as far as the comment that 02's either work or don't that bs the way to check o2s is to hit them w/ propane thru the intake and then stop the propane and you can watch the reaction time of the 02 sensor going from rich to lean i forgot the exact spec but nobody really test o2s as a scope is the preferred tool to use and who has a scope?
 
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