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Old 09-03-2012, 06:14 PM   #1
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P0432 Emissions code

Ok I know there's write ups on this but none that gets me an answer. I have a 2001 Jeep wrangler that threw the P0432 code (some BS about bank 2 blah, blah, blah). I replaced both O2 sensors after the small CAT's because I wasn't sure which bank was bank 2 and reset the code. Ran great for about 2 weeks and then it threw the same code again. Should I replace the other 2 O2 sensors right at the manifold/before the small CATS? Jeep runs great, no idle problems or rattling coming from the exhaust. I read somewhere that a head gasket could also cause this reading because coolant can get into that bank and screw the cat up. Any suggestions before I throw money into a new cat?

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Old 09-03-2012, 08:22 PM   #2
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P0432 is an efficiency problem on the bank 2 upstream catalytic converter. This is the rear-most (rear 3 cylinders) catalytic where your problem code is indicating. It is likely that you have a problem with the converter being burned up/blown out or it is contaminated. The fact the engine is running well and no other codes are showing up, makes it likely that all 4 O2 sensors are working properly. I would remove the exhaust pipe from the engine and have a look at the catalytic converter honeycomb inside, before doing anything else. Also be sure that both electrical connections (and wiring) are good on the two O2 sensors on the rear bank.

Coolant contamination would show up with lower level in the overflow and radiator. You would probably see higher temps on your gauge too.

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Old 09-04-2012, 06:49 AM   #3
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well I do have low coolant in the radiator. I have to add some every few days so maybe I have a bad head gasket?
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Old 09-04-2012, 08:30 AM   #4
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Get a cooling system pressure check. A radiator shop or maybe a car parts dealer could pressurize the system to check if there is a leak. Check your upper radiator hose for pressure when the engine is fully warmed up. Might also check your oil for coolant contamination.
Should still drop the exhaust to check your cat converter.
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Old 09-04-2012, 08:53 AM   #5
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My bet is you'll need to replace the rear-most cat on the exhaust header to permanently get rid of that error code.
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Old 09-04-2012, 09:05 AM   #6
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Quote:
Originally Posted by Jerry Bransford
My bet is you'll need to replace the rear-most cat on the exhaust header to permanently get rid of that error code.
Yep Jerry is right on with this, it is time to get a new exhaust manifold or upgrade to a nice header that wont mess up your emissions and pop codes....
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Old 09-04-2012, 11:26 AM   #7
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Thanks alot guys. I really appreciate the responses. I'll check into the price of that cat along with a pressure check of the radiator system.
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Old 10-24-2013, 10:48 AM   #8
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My TJ threw the P0432 code yesterday, too.

Since the "check engine" light has lit (P0432), my engine idle is now a little rough. The engine accelerates just fine, as usual. It's just that the IDLE is a little rough.

Quote:
Originally Posted by colorubi View Post
P0432 is an efficiency problem on the bank 2 upstream catalytic converter. This is the rear-most (rear 3 cylinders) catalytic where your problem code is indicating. It is likely that you have a problem with the converter being burned up/blown out or it is contaminated. The fact the engine is running well and no other codes are showing up, makes it likely that all 4 O2 sensors are working properly...
Since I now have a little bit of a rough idle, could it be that my Bank 2 Upstream O2 Sensor is bad?


Quote:
Originally Posted by colorubi View Post
... You would probably see higher temps on your gauge too.
My temperature gauge still reads 210°.

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