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Old 02-29-2012, 07:19 PM   #1
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Why are there 3 Cat's on my 2005?

And can you just get down to one Cat and just two O2 sensors or am I stuck with this setup?

No wonder this thing only gets 15 mpg going down hill with a sail up and the engine turned off................it can't breath.

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Old 02-29-2012, 07:22 PM   #2
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Thank California for that crap

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Old 02-29-2012, 07:22 PM   #3
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Doesn't the California models require to have 3 cats?
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Old 02-29-2012, 07:23 PM   #4
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Quote:
Originally Posted by Abnmarine
Doesn't the California models require to have 3 cats?
50 state compliant

Sucks. Wait till your 02's go bad... 4
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Old 02-29-2012, 07:31 PM   #5
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What state are you in?
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Old 02-29-2012, 07:46 PM   #6
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mine has 1 cat..
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Old 02-29-2012, 08:10 PM   #7
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Quote:
Originally Posted by kwn306 View Post
And can you just get down to one Cat and just two O2 sensors or am I stuck with this setup?

No wonder this thing only gets 15 mpg going down hill with a sail up and the engine turned off................it can't breath.
all 3 are required by law, since thats what was installed on your jeep.

the cats breath fine. if it gets 15mpg, then you have something else going on. keep up on maintenance, keep your foot off the throttle, drive like grandma, stay under 60mph, and keep it under 2500rpms whenever possible. I have all 3-cats, with over 85k miles on them, with 4.88s and 33s, and I can get 17-18mpg.
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Old 02-29-2012, 08:51 PM   #8
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What state are you in?
Virginia
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Old 02-29-2012, 08:55 PM   #9
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mine has 1 cat..
You have a 2005, 4.o liter with one Cat? How can that be, all the searching I did shows it needs / has three.

Did you modify........please tell me more.
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Old 02-29-2012, 09:00 PM   #10
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I live in Texas and bought my Jeep in Texas. I noticed it had three cats when I put exhaust on it. My local exhaust guy told me it may of been a California Jeep.
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Old 02-29-2012, 09:07 PM   #11
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Some earlier TJ's have only 1 I believe
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Old 02-29-2012, 09:10 PM   #12
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Quote:
Originally Posted by kwn306 View Post
You have a 2005, 4.o liter with one Cat? How can that be, all the searching I did shows it needs / has three.

Did you modify........please tell me more.
sorry, I have a 2000 4.0 with one cat.

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Old 02-29-2012, 09:30 PM   #13
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Chrysler build sheet would confirm, I have a california emissions jeep with 3cats and 4o2 sensors. I here ya on the o2's... I had 1 upstream replaced just too poor to afford the 3 others...

good luck, its really not that bad.
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Old 02-29-2012, 09:30 PM   #14
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Originally Posted by whitejeep View Post
I live in Texas and bought my Jeep in Texas. I noticed it had three cats when I put exhaust on it. My local exhaust guy told me it may of been a California Jeep.
Emissions regulations get increasingly strick every year. As far as I know, 2000 was the last year you could get one cat, as a non-cali emissions package. All other 4.0L's after that will have 3 cats.
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Old 02-29-2012, 10:29 PM   #15
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Originally Posted by kjeeper10 View Post
Some earlier TJ's have only 1 I believe
My 97 has one cat and 2 o2 sensors.
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Old 02-29-2012, 10:34 PM   #16
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I have two cats. Ones in my house and ones under my jeep. Sometimes they are both under my jeep.
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Old 02-29-2012, 10:39 PM   #17
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When I did my exhaust on my '05, I only noticed 1 cat... I think I would have noticed if there were 2 more. Get your build sheet from Jeep and see what is says... mine says "Federal Tier 2, Bin 9A Emissions" Maybe other people have a different emissions package... mine was purchase in NY
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Old 02-29-2012, 10:41 PM   #18
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Originally Posted by GoldenSahara00 View Post
I have two cats. Ones in my house and ones under my jeep. Sometimes they are both under my jeep.



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Old 02-29-2012, 11:01 PM   #19
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[QUOTE="GoldenSahara00"]I have two cats. Ones in my house and ones under my jeep. Sometimes they are both under my jeep. [/QUOTE

I wish ours were under mine too. They are always on top. First in the mud the on top and then I have cat prints all over my hood. Oh how I hate cats...
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Old 03-01-2012, 05:30 AM   #20
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Quote:
Originally Posted by GoldenSahara00
I have two cats. Ones in my house and ones under my jeep. Sometimes they are both under my jeep.
It was a matter of time haha
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Old 03-01-2012, 06:11 AM   #21
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Nice helmet!

And you gota love little cat prints all over everything...
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Old 03-01-2012, 07:04 AM   #22
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I have two cats.
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Old 03-01-2012, 07:20 AM   #23
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I'm in Louisiana. All I got was two small gators and a nutra rat.
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Old 03-01-2012, 06:18 PM   #24
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Last week I had to replace the second of my four o2 sensors.
Can't wait till I have to replace the others.
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Old 03-01-2012, 06:57 PM   #25
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I'm in Louisiana. All I got was two small gators and a nutra rat.
That's just plain funny!

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