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Old 01-18-2013, 09:30 AM   #1
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P0432 code

My cel came on last night on my way home from work. I stopped by my local Advanced Auto to have them scan it. The code was P0432 catalyst 2-1 efficiency confirmed. I've searched the code on here and have found several posts...but I have a question.

Shouldn't the jeep be running rough if there was a problem with a O2 sensor or cat?? It's running as normal as always at speeds and at idle.

If I understand correctly, the code is referring to the sensor on bank 2, #1 sensor...right??

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Old 01-18-2013, 11:43 AM   #2
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Actually... The 02 sensors have codes of their own. 0432 refers to bank 2 cat inefficiency. It's the most rear cat on the down pipe off the motor You could have a small leak at the flange off the manifold.

Any mods recently done like a body lift or the like? Something may have disrupted the normal seat of the down pipe to the manifold. Any exhaust work done lately?

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Old 01-18-2013, 03:05 PM   #3
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It has a BL that's been on there for several years & no exhaust work has been done on it either.
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Old 01-18-2013, 07:33 PM   #4
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check all your exhaust flange bolts to ensure they are tight..... also check to see if your downpipe is loose at all by crawling under and wiggling it left and right. You will know if its at all loose by wiggling it.

If all that is fine..... you indeed may have a bad cat on the downpipe.... OR.... you could have an 02 sensor that is not reading correctly and throwing this code. I know I said O2's have their own code earlier... and they do... this is just a possibility.

If you have access to a scanner that can monitor O2's.... make sure they are cycling every 2-3 seconds. A slow reading O2 could be an issue.
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Old 01-18-2013, 07:58 PM   #5
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The downpipe does feel loose, but I figured it was supposed to be a little loose for flex purposes. Do I just tighten the bolts holding the downpipe to the headers?
Also, like I was inquiring to on my original post....wouldn't I have sluggish performance or a bad idle if a cat or O2 sensor was indeed faulty?
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Old 01-18-2013, 08:06 PM   #6
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Quote:
Originally Posted by vwlos View Post
The downpipe does feel loose, but I figured it was supposed to be a little loose for flex purposes. Do I just tighten the bolts holding the downpipe to the headers?
Also, like I was inquiring to on my original post....wouldn't I have sluggish performance or a bad idle if a cat or O2 sensor was indeed faulty?
Depends on how bad the cat is clogged or damaged. A bad rear o2 sensor won't cause any drive-ability issues because it's sole job is to check cat efficiency.
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Old 01-18-2013, 08:22 PM   #7
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iirc my 01 through this code because of a bad intake manifold gasket.

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