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Down stream of cat converter sensor


 
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N5JMY
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Joined: 23 Jul 2007
Location: West Tennessee

PostPosted: Mon Jul 23, 2007 2:44 pm    Post subject: Down stream of cat converter sensor Reply with quote

My down stream exhaust (CO) sensor is bad--check engine light on my 01 TJ 4.0 came on and Auto Zone put thier diagnostic machine on it & said "it's bad". Anyway out where I live they don't check vehicles exhaust and instead of replacing the sensor I was thinking of removing it totally.
My TJ has 87,000 miles on it.

OK guys any helpful ideas on the subject???????
Any unhelpful thoughts are alright too!
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badger
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Joined: 16 Sep 2005
Location: Utah

PostPosted: Mon Jul 23, 2007 3:42 pm    Post subject: Reply with quote

sorry but you are running an OBDII system and its looking for the difference between the two sensors to adjust whats going on in the motor.

not wise to eliminate it.
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blktrax
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Joined: 01 May 2007

PostPosted: Mon Jul 23, 2007 4:58 pm    Post subject: Reply with quote

It will cause the motor to run rich and two things will happen, first the cat will clog with carbon build up(if it hasnt already, and thats what caused the O2 to go bad in the first place) and second your gas milage will get really bad; well worse than it is already. If you can find one either advance or autozone get one if possible with a lifetime warranty. That way if the cat is bad and messes that O2 up, you get that one replaced for free and just have the cat replaced.
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Mix1980
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Joined: 28 Jun 2007
Location: North Carolina

PostPosted: Tue Jul 24, 2007 5:15 am    Post subject: Reply with quote

I agree that you need to replace it. It might cost you about $60.00 to replace both o2 sensors that are downstream. If you have a 6cyl then you have 2 up and 2 downstream. I just went through this in diagnosing my 05. There are plenty of good write ups and I'm sure you're plenty handy to change them out.
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