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Unread 05-15-2011, 07:25 PM   #1
Lil_Ape
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2002 WJ 
 
Join Date: May 2009
Location: Houston, TX
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Need some help with code P0432

Main Catalyst Efficiency Below Threshold (Bank 2)
Catalyst 2/1 efficiency below required level.

So the code showed up just this morning while driving and at first i thought it was the magnaflow cat on the kolak exhaust i just installed two weeks ago. But i did some searching and from what I've come across its either a bad O2 sensor or the pre cat on the passenger side is bad. I'm leaning towards a bad pre cat because at WOT i get a foul odor that could best be describes as rotten eggs, and apparently that's a sign of a bad cat. So far i only get the smell at WOT, not casual or hard driving. I'm thinking the code showed up right after i went WOT up a steep hill. But my question is are there any aftermarket pre cat options that anyone knows of, such as magnaflow? If i get them replaced, I'd rather go with a less restrictive, and maybe cheaper aftermarket version over OEM. The jeep did just pass inspection in April, so have a whole year to fix this problem.

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Unread 05-18-2011, 04:06 PM   #2
nickblack
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Try Rock Auto, they have the 2 mini cats you are looking for. They are manufactured by Eastern Catalytic Converter and are $260 on the website. I bought one 2 years ago and have passed emissions and thus far have had no problems. The OEM one is over $800.
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Unread 05-18-2011, 04:10 PM   #3
Thomahawk
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Quote:
Originally Posted by Lil_Ape
Main Catalyst Efficiency Below Threshold (Bank 2)
Catalyst 2/1 efficiency below required level.

So the code showed up just this morning while driving and at first i thought it was the magnaflow cat on the kolak exhaust i just installed two weeks ago. But i did some searching and from what I've come across its either a bad O2 sensor or the pre cat on the passenger side is bad. I'm leaning towards a bad pre cat because at WOT i get a foul odor that could best be describes as rotten eggs, and apparently that's a sign of a bad cat. So far i only get the smell at WOT, not casual or hard driving. I'm thinking the code showed up right after i went WOT up a steep hill. But my question is are there any aftermarket pre cat options that anyone knows of, such as magnaflow? If i get them replaced, I'd rather go with a less restrictive, and maybe cheaper aftermarket version over OEM. The jeep did just pass inspection in April, so have a whole year to fix this problem.
How is That Kolak system working for you? Can you feel Any gain in torque?
I am going to order this from Kolak soon, i know He also sell highflow precats.
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Unread 05-18-2011, 07:36 PM   #4
Lil_Ape
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Quote:
Originally Posted by Thomahawk View Post
How is That Kolak system working for you? Can you feel Any gain in torque?
I am going to order this from Kolak soon, i know He also sell highflow precats.
There is definitely a power increase, especially in the higher RPM's. It takes almost half the time to get from 60mph to 90mph and the tires squeal even shortly after shifting into 2nd at WOT from a dead stop. My rear tires are a little worn so the helps too. Even picked up a couple MPG's, and of course the sound is great. Nick said his exhaust put out 15-20hp on the dyno when he tested it years ago. I would highly recommend his setup over over a basic 2.5" catback.


As far as the P0432 code goes, i reset it a few days ago and have been driving for a while and it hasn't appeared yet. All casual driving, no WOT runs. If the code doesn't show up in a few more days, i will start driving harder and going WOT and see if it shows up then.
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