my catless downpipes throw check engine after Dealership upgraded the new emission

LACA335i · 12-16-2007, 07:46 PM

I just recieve a Cel on my car. It said on the DTC with Vishnu DTC reader
P0420 and P0420. It said something about cat is below the thread hold. SHiv I need your help..

zenmaster · 12-16-2007, 07:49 PM

Put the cat above the thread hold.

LACA335i · 12-16-2007, 07:52 PM

Quote:

Originally Posted by zenmaster

Put the cat above the thread hold.

i have no cat dude.

zenmaster · 12-16-2007, 07:55 PM

Disclose your mods which may help the forum out. What were the most recent changes to your set up?

scalbert · 12-16-2007, 07:57 PM

Quote:

Originally Posted by LACA335i

i have no cat dude.

Bingo, that is your problem...

This has nothing to do with the PROcede if I am understanding this correctly. You removed your catalytic converters? Which ones?

LACA335i · 12-16-2007, 07:59 PM

Quote:

Originally Posted by zenmaster

Disclose your mods which may help the forum out. What were the most recent changes to your set up?

Well i recently test a friend downpipe without a cat. All i have are Vishnu v2.0.2 mt. I dont have any cat at all. Help me shiv..

LACA335i · 12-16-2007, 08:00 PM

Quote:

Originally Posted by scalbert

Bingo, that is your problem...

This has nothing to do with the PROcede if I am understanding this correctly. You removed your catalytic converters? Which ones?

The primary one.

scalbert · 12-16-2007, 08:01 PM

Quote:

Originally Posted by LACA335i

The primary one.

The the code is valid and has noting to do with the PROcede. This is not Vishnu's responsibility.

LACA335i · 12-16-2007, 08:04 PM

Quote:

Originally Posted by scalbert

The the code is valid and has noting to do with the PROcede. This is not Vishnu's responsibility.

i know that.. i just want to see what shiv can help me out.

rideelement247 · 12-16-2007, 08:08 PM

Quote:

Originally Posted by LACA335i

i know that.. i just want to see what shiv can help me out.

Shiv can't help you on this one, it's not his software doing it. If you had no piggyback, you would still throw the same code.

Terry is going to be coming out with O2 simms to take care of this problem soon.

There is nothing you can do but clear the code and deal with it until Terry finalizes his solution.

zenmaster · 12-16-2007, 08:10 PM

Do your catless downpipes, with same install, work fine in other 335i's?

rideelement247 · 12-16-2007, 08:15 PM

Quote:

Originally Posted by zenmaster

Do your catless downpipes, with same install, work fine in other 335i's?

No. As long a you have a car with newer software, then you will throw a code. If you among the first couple of batches of 335is, you won't throw a code, unless the dealer updated your software like they were supposed to do. It was part of an Emissions update.

LACA335i · 12-16-2007, 08:16 PM

Quote:

Originally Posted by zenmaster

Do your catless downpipes, with same install, work fine in other 335i's?

I dont know my friend said he installed back in the downpip

zenmaster · 12-16-2007, 08:17 PM

Why would someone go through the cost, hassle, and possible damage without doing research about this first?

Sniz · 12-16-2007, 08:19 PM

Quote:

Originally Posted by LACA335i

I dont know my friend said he installed back in the downpip

I'm not sure what you just said there.....

You will throw a code as long as you have those downpipes in your car in their current configuration. Plain and simple.

down4it · 12-16-2007, 08:24 PM

Get extended o2 bungs...

rideelement247 · 12-16-2007, 08:26 PM

Quote:

Originally Posted by down4it

Get extended o2 bungs...

Did that work for you?

It didn't work for me. I did 1 on each bunghole, but then a code still came on and decided it wasn't long enough to satisfy my bunghole, whereas I gladly accepted 2 in each bunghole, which still threw a code.

LACA335i · 12-16-2007, 08:36 PM

Quote:

Originally Posted by down4it

Get extended o2 bungs...

where can i get them and how much .. is it the same as o2 sensor simulator

max boost · 12-16-2007, 08:38 PM

why spend the time and money on downpipes?? whoppie do.....a couple of hp.....loose 25 30 lbs of fat around your mid section and youll be better off....
to me it make no sence

zenmaster · 12-16-2007, 08:41 PM

Quote:

Originally Posted by max boost

why spend the time and money on downpipes?? whoppie do.....a couple of hp.....

This is probably wrong. The airflow through the 335i's stock DPs might be good, but not that good.

rideelement247 · 12-16-2007, 08:49 PM

Quote:

Originally Posted by LACA335i

where can i get them and how much .. is it the same as o2 sensor simulator

They are not the same. The O2 sim is like a tiny PROcede unit that plugs into the ECU. The O2 extenders are simply Sparkplug Nonfoulers bought from any Pep Boys, Autozone, etc.

I forgot the dimension of the extender, you will either have to look it up, or ask someone here if you are going to do it, but from my experience it is a waste of time.

max boost · 12-16-2007, 08:53 PM

Quote:

Originally Posted by zenmaster

This is probably wrong. The airflow through the 335i's stock DPs might be good, but not that good.

yeah ur right....a little more.....1 or 2

j/k

12-16-2007, 07:46 PM	#1
LACA335i Lieutenant Colonel 175 Rep 1,517 Posts Drives: E92 335i coupe Black AUTO Join Date: Apr 2007 Location: Alhambra, CA iTrader: (0) Garage List 2007 335I SEDAN [0.00]	my catless downpipes throw check engine after Dealership upgraded the new emission I just recieve a Cel on my car. It said on the DTC with Vishnu DTC reader P0420 and P0420. It said something about cat is below the thread hold. SHiv I need your help.. __________________ Last edited by LACA335i; 12-17-2007 at 01:06 AM..
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12-16-2007, 07:49 PM	#2
zenmaster Brigadier General 1577 Rep 3,888 Posts Drives: '17 M2 Join Date: Mar 2007 Location: Atlanta iTrader: (1)	Put the cat above the thread hold.
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12-16-2007, 07:55 PM	#4
zenmaster Brigadier General 1577 Rep 3,888 Posts Drives: '17 M2 Join Date: Mar 2007 Location: Atlanta iTrader: (1)	Disclose your mods which may help the forum out. What were the most recent changes to your set up?
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12-16-2007, 08:10 PM	#11
zenmaster Brigadier General 1577 Rep 3,888 Posts Drives: '17 M2 Join Date: Mar 2007 Location: Atlanta iTrader: (1)	Do your catless downpipes, with same install, work fine in other 335i's?
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12-16-2007, 08:17 PM	#14
zenmaster Brigadier General 1577 Rep 3,888 Posts Drives: '17 M2 Join Date: Mar 2007 Location: Atlanta iTrader: (1)	Why would someone go through the cost, hassle, and possible damage without doing research about this first?
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12-16-2007, 08:24 PM	#16
down4it Banned 63 Rep 1,743 Posts Drives: E92 335i Join Date: Jul 2007 Location: SoCal iTrader: (3)	Get extended o2 bungs...
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12-16-2007, 08:38 PM	#19
max boost Lieutenant 40 Rep 408 Posts Drives: 07 335i Join Date: Nov 2006 Location: east side iTrader: (1)	why spend the time and money on downpipes?? whoppie do.....a couple of hp.....loose 25 30 lbs of fat around your mid section and youll be better off.... to me it make no sence
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