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Old 12-20-2009, 07:51 PM   #1
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code po432

got a p0432 code called the dealership and they told me they would charge me a 120.00 to put on dianogstic machine if it is cat converter i dont have to pay the 120.00 or the for cat conver . now is the p0432 code just for the cat or could a o2 be out any help would be apprectiated
but if its not the cat i have to pay the 120.00 04 45,000 miles

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Old 12-20-2009, 07:55 PM   #2
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Hmm.. I went to get a new exhaust when I got my Jeep and they guy said I needed a new cat converter too..

Said 250 cash for Flowmaster and new cat conver...

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Old 12-20-2009, 08:17 PM   #3
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Old 12-21-2009, 07:16 AM   #4
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So here's the deal. The code translates exactly to, "Main Catalyst Efficiency Below Threshold (Bank 2). Bank 2 is the rear 3 cylinders. There is an oxygen sensor before and after the converter. They meter input and output from the converter, and tell the PCM how to adjust fuel mapping and ignition timing to correct you run condition, just like we all used to do manually with a carbuerator's adjustments. It sounds like those 3 cylinders are feeding too much fuel into the exhaust (more than the converter can account for). Check the spark plugs to see if they're firing, run some injector cleaner through the gas. The list of things that can set these codes is limited to any component that makes the motor run, but is very rarely the actual exhaust components. Unless of course, you've done such things as running race fuel or using some sort of programmer modifications, both of which enhance exhaust temp and melt parts.
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Old 12-22-2009, 08:06 PM   #5
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before and after i see 2 of them one on each pipe there below the pre cats replaced both o2 sensors and flashed system. went to fire up and did not want to idle did this a couple times until it finally stated to idle now i wait to see if code pops back up. just got the jeep about 3 months ago. it looked like it was wheeled pretty good there was mud every where. lol

thanks everyone for the input ill have to do test. it doesnt run bad at all.i do notice a small stumble every now and again while idleing at stop sign
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Old 12-22-2009, 08:41 PM   #6
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just went out and took a look and ill be dammed if there was'nt 2 more above the pre cats. so now i have 2 new sensors both on bottom pipes im guessing bank 1 and bank 2 i think i need to take the sensor from bank 1 and put it up top in bank 2 . im also geussing there all the same except the link and the connecter might be diff
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Old 12-22-2009, 08:55 PM   #7
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meesed up
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Old 11-12-2013, 11:34 AM   #8
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Quote:
Originally Posted by jmurle000 View Post
... Bank 2 is the rear 3 cylinders...
Thank you. This is exactly the information I was looking for.
Now I know which one of my O2 sensors to replace. (All this bank 1, bank 2, sensor 1, senor 2 stuff was confusing me.)


Quote:
Originally Posted by jmurle000 View Post
... Check the spark plugs to see if they're firing, run some injector cleaner through the gas...
Could it be that one or more of the REAR spark plugs are getting fouled, & therefore, not firing? Are all injector cleaners the same? Are there any brands that you should stay away from?
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Old 11-12-2013, 11:43 AM   #9
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Mine threw that code and it was just the upstream o2 sensor.. .replaced it and havent had an issue since
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Old 11-12-2013, 02:35 PM   #10
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Quote:
Originally Posted by jmurle000 View Post
... The code translates exactly to, "Main Catalyst Efficiency Below Threshold (Bank 2) ... those 3 cylinders are feeding too much fuel into the exhaust (more than the converter can account for)...
Quote:
Originally Posted by K.wag View Post
Mine threw that code and it was just the upstream o2 sensor.. .replaced it and havent had an issue since
I don't understand how replacing the UPSTREAM O2 would have helped in this situation. I thought a P0432 code referenced the DOWMSTREAM O2, not the UPSTREAM O2.

Maybe just a coincidence.
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Old 11-12-2013, 06:39 PM   #11
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OK guys. The Upstream O2 sensor measures the air to make sure it has the correct air/fuel ratio. The Downstream tests the air to make sure the cats are working. P0432 is a code tripped by the downstream sensor. This means that the air passing through the cats was not up to standards. This does not mean you have missfires. If you had missfires the CEL would blink. A simple way to check if your cats are good or bad is to unbolt the exhaust system and look down the two tubes connected to the mini cats. You want to check for webbing material. If you see broken webbing or a ball of stuff then your cat is bad.
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Old 11-12-2013, 06:47 PM   #12
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I would disagree. The downstream simply checks the value versus the upstream one. If it detects an anomaly it throws the code. Therefore I guess it could be upstream (if it is bad it will return no value and thus the downstream will be different), downstream or the cats.

Either way, I can report from my experience of the Engine code being read by the shop, them telling me to replace the upstream sensor, which I did, and not having a problem since.
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Old 11-12-2013, 06:55 PM   #13
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When using a code reader, I believe it should say sensor 1 or sensor 2.
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Old 11-13-2013, 12:04 AM   #14
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I had this code on my 05. I replaced all four O2 sensors...no dice, checked all exhaust connections....not loose. So, I ended up ripping the entire exhaust out to check the cats and sure enough, the pre cat (up by the manifold), the one toward the rear that is was blown out....throwing that code. It wasn't messing with fuel economy too much but the only way I found to get rid of it was replacing the entire downpipe which ran me about 500 since the new unit comes with the pre cats installed. It fixed it though. Friggin emissions standards.
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Old 11-14-2013, 08:16 PM   #15
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Mine recently threw the same code and it ended up being the rear pre-cat just like ReconJack. The mid pipe was filled with pieces from it all the way back into the third cat. I dumped out what I could and did the anti-fouler trick (it's 18mm btw) but I will probably end up replacing it with a new mid-pipe from rock auto sometime soon.
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Old 11-16-2013, 09:29 AM   #16
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My P0432 code was caused by a bad pre-cat. It eventually came apart clogging the main catalytic converter so completely and so suddenly I had to pull off the highway. The main cat was so plugged that the max speed I could drive it was 5-10 mph for a 15 mile trip to a friend's house where the cats were replaced. The old 02 sensors were reused since they were still good.

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