Moving my O2 sensor?? Help Please -
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Unread 08-11-2010, 02:27 PM   #1
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1997 TJ Wrangler 
Join Date: Mar 2010
Location: Georgia
Posts: 19
Moving my O2 sensor?? Help Please

So taking advice from many Wheelers on here, I recently sold my YJ 2.5l and got me a TJ with the 4.0. Now a week later I am releazing it is sluggish and seems less powerful than the 4 cyl? No engine light on, but you can hear the rattle from the cat breaking up inside. I took it to a local muffler shop just to make sure this was the problem and they have confirmed it. However, they price quoted me for $600 for new cat muffler installed. This is rediculous and I am not paying it. My question is has anyone ever gutted there cat and straight piped it? My 1997 has a sensor on the cat so do u think if i did this i would be able to move the sensor right behind where the cat sits on the pipe itself? Would this throw codes? Please help if u have done this or have any advice.

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Unread 08-11-2010, 02:51 PM   #2
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2003 TJ Wrangler 
Join Date: May 2009
Location: The Republic of Dave
Posts: 6,408
You can do it, and many people have done so...but it's illegal as hell. Federally illegal as hell, too. It's been covered many, many, many times already.

Simple solution: spend about a hundred bucks on an aftermarket cat, and keep your sensors where they're supposed to be. It's honestly the easiest, most direct fix for your problem. It's cheaper than what you were quoted (by a long shot), it's environmentally friendly, and it's not going to cause you to get fined if you get caught.
If it's worth doing, then it's worth [I]over[/I]doing.

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Unread 08-11-2010, 03:58 PM   #3
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1997 TJ Wrangler 
Join Date: Oct 2009
Location: Longmont, Colorado
Posts: 7,058
You can get "high flow" cats for a bit over 100 dollars. Most cheap non vehicle specific ones don't come with o2 sensor bung holes, so you simply drill a hole down stream, attempt to screw it in, and then an exhaust sealant. It's what I did.
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Unread 08-11-2010, 04:06 PM   #4
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1981 CJ7 
Join Date: Aug 2010
Location: Tomball
Posts: 1
I removed my cat completely and installed and O2 simulator. I made a huge difference!!
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catalytic converter , exhaust , help please , oxygen sensor , tj

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