Cat converter failure 96 GC 4.0L -
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Unread 08-06-2009, 11:04 AM   #1
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Cat converter failure 96 GC 4.0L

So I finally pulled the engine codes thanks to some people here on the forum.

I got the error code of 72 and 12 (battery one which I dont think is a problem since I had to be boosted not long ago). And 72 being the cat converter failure, my question is, can I just replace that with a straight pipe or a resonator? Or do I need to put a new cat converter in? I know with the OBDII systems, there is a sensor on both ends of it and it would need to be replaced, but I am pretty sure its an OBDI system.



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Unread 08-07-2009, 07:58 PM   #2
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1999 XJ Cherokee 
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you have to bite the bullet and by a new cat. in order to pass inspection the cat has to be there. if you just ran your heep on trails only you would be ok with removing the cat.
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Unread 08-07-2009, 08:04 PM   #3
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1997 ZJ 
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you're obdii, be nice to the environment and pay the 75$ for a carsound high flow replacement.
'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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Unread 08-07-2009, 08:07 PM   #4
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1998 ZJ 
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Yay! Another calgarian!

Danny, we dont have to have a cat on our Jeeps but I would highly suggest one. I ran for a while just straight piped and it didnt really run too well. Are you still stock or modded. PM me. I can help you with the CEL as well.
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Unread 08-07-2009, 10:58 PM   #5
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1995 ZJ 
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if you run a strait pipe you will probally keep the check engine light for a bad cat. The system recognizes the cat as working by there being less (or more) oxygen sensed by the post cats o2 sensor
95 ZJ, 5.2 V8,160,000 miles
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Or just tie a 12 lb fish to a one foot pipe.
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