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Go Back JeepForum.com > Models > Jeep Wrangler Forums > TJ Wrangler Technical Forum > How do you know if the O2 sensor is bad?

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Unread 05-26-2008, 07:08 PM   #1
wraub
Registered User
1998 TJ Wrangler 
 
Join Date: May 2008
Location: Indiana
Posts: 27
How do you know if the O2 sensor is bad?

I have seen a large number of O2 sensor questions on this site and was wondering how to tell if it's bad. I know that the O2 sensor closest to the manifold has a lot to do with mileage. I just replaced the cracked manifold on my wrangler, now it runs a lot better but now I am wondering if I need to replace my O2 sensor. Another question I have on the O2 sensor is, who makes the best. Its pretty hard these days when you go to Auto Zone or any other Auto parts store and yo have several different options to choose from. One may cost $30.00 the next may be double. so how do you know which one to get. These days with the price of gas as high as it is if I can increase my MPG why not? Or if anyone else out there has any other suggestions on increasing MPG I would really like to here from you. All replies are greatly appreciated. Thanks...Ed

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Unread 05-26-2008, 07:13 PM   #2
raskull
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2003 TJ Wrangler 
 
Join Date: Jun 2006
Location: Edmonton, Alberta
Posts: 1,799
It doesn't look like you've run a check yet to see if your jeep has any codes. Here, you might find this article helpful.

http://myjeeptj.com/2008/04/20/1998-...agnostic-codes
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Unread 05-26-2008, 08:27 PM   #3
Kpat
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2000 XJ Cherokee 
 
Join Date: Apr 2008
Location: Northern Ontario
Posts: 309
Quote:
Originally Posted by wraub View Post
I have seen a large number of O2 sensor questions on this site and was wondering how to tell if it's bad. I know that the O2 sensor closest to the manifold has a lot to do with mileage. I just replaced the cracked manifold on my wrangler, now it runs a lot better but now I am wondering if I need to replace my O2 sensor. Another question I have on the O2 sensor is, who makes the best. Its pretty hard these days when you go to Auto Zone or any other Auto parts store and yo have several different options to choose from. One may cost $30.00 the next may be double. so how do you know which one to get. These days with the price of gas as high as it is if I can increase my MPG why not? Or if anyone else out there has any other suggestions on increasing MPG I would really like to here from you. All replies are greatly appreciated. Thanks...Ed

Why not go to any emissions test center?
I know apple auto glass runs tests, they can easily tell you the exact numbers your looking for.
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