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Old 02-18-2011, 12:33 PM   #1
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CEL On..Replace Catalytic converter?

The CEL in my Jeep has been on for a long time and the ODM code reads P0432 Catalyst efficiency low bank 2..The probable causes are listed as cat defective, engine misfire, large vacuum leak, or oil leakage into exhaust-valve guide seals.

I have replaced the spark plugs but now the light is still on and I am pretty lost on what to attack next... Does the bank 2 mean it is a precat and is it worth replacing the pre-cats or the rear cat to blindly try and solve this problem?? Should I try replacing to O2 sensors first?

Also the only air leak i found in the exhaust was a small hole in the front bottom of the muffler..Is this what's called a weep hole or is it from rust and should also be cut out and replaced?

Thanks for all the help in advance.

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Old 02-18-2011, 01:21 PM   #2
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How old/many miles is your Jeep? . . . I think the CAT is covered for 7yrs and 70k miles. On my 2006 the CAT went bad and took out the O2 sensor so the warranty covered the CAT and I only had to pay 100 bucks for the O2 sensor . . . from what I was told, if I would have replaced the sensor, it probably would have gone bad quickly due to the CAT. My advice is if you are within the Emmissions warranty period, take it to the dealer and tell them that not only is the code coming up, but you keep smelling rotten eggs . . . chances are that will help and rather than dicking you around and trying to replace this or that first, they'll just bite the bullet and replace the CAT for you. Even if you don't need a new CAT, might as well give it a try as you will soon enough and outside of the warranty it's pretty pricey.

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Old 02-18-2011, 01:31 PM   #3
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Yeah unfortunately it's a 2001 with 108000 miles on it and it's all stock so prob out of warranty range right?
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Old 02-18-2011, 02:59 PM   #4
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Does anyone know what the Bank 2 is?
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Old 02-18-2011, 03:50 PM   #5
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Typically Bank 1 is the upper section, bank 2 the lower. Usually these refer to a specific O2 sensor.

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Old 02-18-2011, 05:05 PM   #6
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Yes go for the least expensive first, look for exhaust leaks, then 02 sensors. Bank two is downstream, but it's a good idea to replace them all.

My story : )

Just fixed a p0431 code ( same but different bank ) had an exhaust leak (intake manifold) that I had fixed, CEL was off for 3 weeks then it came back on for the same code so I replaced ALL the 02 sensors, I believe the service manual says there good for 100,000 miles?? Anyways it has been about 2 months and no CEL. The jeep runs better too : )



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Old 02-18-2011, 05:33 PM   #7
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Yes go for the least expensive first, look for exhaust leaks, then 02 sensors. Bank two is downstream, but it's a good idea to replace them all.

My story : )

Just fixed a p0431 code ( same but different bank ) had an exhaust leak (intake manifold) that I had fixed, CEL was off for 3 weeks then it came back on for the same code so I replaced ALL the 02 sensors, I believe the service manual says there good for 100,000 miles?? Anyways it has been about 2 months and no CEL. The jeep runs better too : )



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Any idea on what O2 sensors work best in 01 wranglers or where to get them cheap? Thanks a bunch for the help.
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Old 02-18-2011, 05:37 PM   #8
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OEM all the way, NGK makes them, so you can buy at almost any auto store like Napa.

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Old 02-18-2011, 05:39 PM   #9
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I have 4, mine is an 01 also, they were around $50-$60 apiece.

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Old 02-18-2011, 06:07 PM   #10
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Bank 1 - the front 3 cylinders
Bank 2 - the rear 3 cylinders.

Depending on what state it first sold in, you may have 4 O2 sensors. Upstreams and downstreams - 2 on each bank. One on each side of the cats.

Your code should tell you which.

Yes, the small hole is a weep hole - unless it's rust, look closely.

While you are under there, look closely for an exhaust leak - you'll see carbon tracks around it.
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Old 02-18-2011, 06:37 PM   #11
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Quote:
Originally Posted by rrich
Bank 1 - the front 3 cylinders
Bank 2 - the rear 3 cylinders.

Depending on what state it first sold in, you may have 4 O2 sensors. Upstreams and downstreams - 2 on each bank. One on each side of the cats.

Your code should tell you which.

Yes, the small hole is a weep hole - unless it's rust, look closely.

While you are under there, look closely for an exhaust leak - you'll see carbon tracks around it.
That's correct on the banks, I don't know what the hell I was talking about, quickly agreeing on other post??

I thought all 2000 and up Tj's were made 50 state legal ( pre cats and four 02 sensors, 2 up and 2 down). I'm curious to know this?

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Old 02-18-2011, 09:48 PM   #12
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O2 sensors get old and lazy - like us! They usually are fine for about 80,000 miles, then start getting lazy. They don't set a code unless they completely die (hmmm, like us too.)

I don't think 4 sensors are used in all states - I could be Wrong.

The pre-cats rarely plug - they are only a screen inside - you can see right through them. The screen gets super hot and promotes further burning of escaped fuel.
When you pull out the O2 sensors you'll see if it's badly carboned up.

Before spending money, I'd very closely check for an exhaust leak.
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Old 02-18-2011, 09:52 PM   #13
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Awesome thanks a lot, got lots to do this weekend now..
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Old 02-19-2011, 11:29 AM   #14
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O2 sensors get old and lazy - like us! They usually are fine for about 80,000 miles, then start getting lazy. They don't set a code unless they completely die (hmmm, like us too.)

I don't think 4 sensors are used in all states - I could be Wrong.

The pre-cats rarely plug - they are only a screen inside - you can see right through them. The screen gets super hot and promotes further burning of escaped fuel.
When you pull out the O2 sensors you'll see if it's badly carboned up.

Before spending money, I'd very closely check for an exhaust leak.

Any idea the easiest way to fix an exhaust leak? I'm assuming just feel for air and look for carbon markings to find one right?
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Old 02-19-2011, 11:53 AM   #15
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A exhaust leak near the muffler ( after the sensors won't set a code off.

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Old 02-19-2011, 12:12 PM   #16
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Dark night or dark garage -
Crawl under it
Assistant sprays light oil, or WD-40 into the throttle body.
You use a strong pencil beam flashlight looking for smoke coming out of someplace it shouldn't.
A thin bright pencil beam works best, a wide beam illuminates too much and makes it hard to see.
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Old 02-19-2011, 04:20 PM   #17
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So back to the O2 sensors I am still confused how many I have..I found a total of four near the two pre-cats (Two above and two below them). Are there also two near the rear cat, making a total of six on my TJ?

I can't see these if they're there because of the skid plate in the way...
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Old 02-19-2011, 05:06 PM   #18
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Should have four, 2 pre and 2 post.

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Old 02-19-2011, 06:19 PM   #19
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Last question and then i'll shut up..is it hard to splice the wiring on the OEM sensors and do you need to buy any other connectors in addition to just the new sensor??
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Old 02-19-2011, 06:51 PM   #20
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The oem are made my NGK and you can buy them at napa, autozone, etc. They will have the proper pigtail and connector, no spicing needed.

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Old 02-19-2011, 09:49 PM   #21
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If you have to change the connectors - YOU HAVE THE WRONG ONES!
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Old 02-19-2011, 11:23 PM   #22
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Last question and then i'll shut up..is it hard to splice the wiring on the OEM sensors and do you need to buy any other connectors in addition to just the new sensor??
Save yourself the trouble and spend the extra money and get the ones with the correct OEM plug on them. Some places will sell the O2 sensors with just a pigtail and you then cut off and splice your old end on them. In the long run you can have more problems. Bad splices, corrosion etc.

On your Jeep you will not have more than 4 o2 sensors 2 in the exhaust header area, and 2 under the Jeep by the catalytic converter area. Some Jeeps have only 2 sensors, but you will have four. No Jeep has more than 4 sensors. It used to be the California emissions Jeeps had 4 and all others had two but I think that has changed now. NEVER more than 4 though.

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