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Old 02-20-2020, 11:23 AM   #1
bGTOb330ci
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O2 Sensor Gurus - P0430

Hello, I am trying to figure out if my cat is bad or there is some other cause of the P0430 code that I am getting.

The car is a 330Ci with 205000 miles on the clock. I just bought it in January, and since then I replaced the CCV and hoses, the MAF, pre-cat O2 sensors, and ET/water pump/thermostat. After the CCV, MAF, and pre-cat O2 sensors, I got it through smog and then a week or so later the P0430 started showing up.

Based on searches and research it sounds like if the rear O2s line up with the front O2 sensors, chances are the cats are bad, but it seems like from the data that sometimes the rear O2 data is very steady, and other times its moving around, so I'm having trouble interpreting the data. Can anyone help me out?

Log from my commute this morning: https://docs.google.com/spreadsheets...it?usp=sharing
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Old 02-21-2020, 01:48 AM   #2
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P0430: Catalyst System Efficiency Below Threshold (Bank 2)
That's the typical code for a bad cat.

Exhaust back pressure test is the correct way to check. Google for details.
A quick test is to just remove both pre-cat O2 sensors, take it for a quick drive, and see if the power goes up noticeably.
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Old 02-21-2020, 07:42 AM   #3
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If the catalytic converters are starting to clog....?
Two doses (two successive tankfuls of fuel) of BG 44K has a decent enough of a chance of starting to clear them.

Then if there is an improvement (predicated upon unconfirmed diagnosis above) you will need to get to the root cause. Chemically cleaning the rings & combustion chamber to restore normal function.

Let us know what you find and from there I can once again review the process of how to clean the rings/cats.
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Old 02-21-2020, 08:39 AM   #4
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if your cats are clogged you're driving like grand ma

you gota beat on engines to keep them clean

aside from proper oil change intervals
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Old 02-21-2020, 01:41 PM   #5
bGTOb330ci
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Quote:
Originally Posted by BaliDawg View Post
P0430: Catalyst System Efficiency Below Threshold (Bank 2)
That's the typical code for a bad cat.

Exhaust back pressure test is the correct way to check. Google for details.
A quick test is to just remove both pre-cat O2 sensors, take it for a quick drive, and see if the power goes up noticeably.
Thank you, will look into doing this, though it doesn't necessarily feel like I am down on power. To confirm, running around with holes in your exhaust manifolds isn't going to hurt anything in the engine bay??

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Originally Posted by MrMCar View Post
If the catalytic converters are starting to clog....?
Two doses (two successive tankfuls of fuel) of BG 44K has a decent enough of a chance of starting to clear them.

Then if there is an improvement (predicated upon unconfirmed diagnosis above) you will need to get to the root cause. Chemically cleaning the rings & combustion chamber to restore normal function.

Let us know what you find and from there I can once again review the process of how to clean the rings/cats.
I've ran Seafoam through it front the brake booster line and the gas tank, as well as the CRC G2P stuff. I can try BG 44K though.

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Originally Posted by wasp9166 View Post
if your cats are clogged you're driving like grand ma

you gota beat on engines to keep them clean

aside from proper oil change intervals
Yeah the car had 203,000 mi on it when I bought it last month so I'm not going to take responsibility for that one

It also had a large intake leak post MAF and reportedly bad CCV system (TBH I didn't see much wrong with it when I pulled it but oh well, its fresh now).
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Old 02-21-2020, 03:41 PM   #6
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yeah, most of these cars are driven by women as a status thing , and they baby them

from my exp in my 54 yrs, the more you beat on a motor , the happier it seems in the long run

i've seen many motors babied and fkd up


i rem taking a kids motocross bike for spin , i screamed it out

he gets back on it and says, wow , it runs better now


they need to be blown out


my car sits all winter, but every month i take it out and make a point to let it scream thru all the gears up to about 80mph or so once , after it's warmed up
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Old 02-21-2020, 04:30 PM   #7
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Originally Posted by bGTOb330ci View Post
running around with holes in your exhaust manifolds isn't going to hurt anything in the engine bay?
Itís pretty noisy and you donít want to leave it like that. But a short run for a few minutes wonít hurt anything.
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Old 02-21-2020, 05:17 PM   #8
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Originally Posted by wasp9166 View Post
if your cats are clogged you're driving like grand ma

you gota beat on engines to keep them clean

aside from proper oil change intervals
I'm not sure why grandma kept a constant rpm at 2500 rpm would cause a clogged cats, while beating on the engine (up 4000 rpm then close throttle like road race) is better for engine.
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Old 02-22-2020, 11:17 AM   #9
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Lower revs typically lug the engine. All modern BMW engines like to rev. They are designed to run triple digit speeds on the autobahn for hours.
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