N54, downpipes and downpipe fix, now service light...

2008135i · 12-11-2016, 01:14 PM

Hey guys,
Let me start by saying I did research this (so lets not freak out), and although I came up with some info, nothing as helped solve the issue.

Car info:
I have a 2008 135i, and just install the VRSF 3" downpipes and downpipe fix (installed via the Burger Motorsports installation guide), and I'm getting intermittent codes for P2098 (bank 2 post cat lean), P2096 (bank 1 post cat lean), and P0041 (Post cat O2 sensors swapped). Car seems to run, drive, and idle great.

Issue frequency:
I installed the downpipes and downpipe fix and ran the car for about 150 miles without issue, and now just stated getting issues. First time it happened I just cleared the codes and ran the car another 80+ miles without issue. Now it seems to throwing these codes about every 10 to 30 miles now.

Corrective actions:
Seeing as I keep getting the post cat o2 sensors swapped code I decided to swap them (even though I had them correct: black bank 1, grey bank 2). I still get the same 3 codes even after the swap.

Suggestions?
Any suggestions on what to try next? I was thinking of swapping the o2's back to the correct spots (black front, grey rear), and then try and remove the downpipe fix so see if its that.... Is it possible I just don't have the downpipe fix adjusted right, even though it drove fine for 150+ miles after the install?

Thanks for any help!

Tinsta · 12-11-2016, 03:02 PM

Have you got a jb4 installed too? As I'm sure the jb4 has a builtin a downpipe fix already as a feature.

2008135i · 12-11-2016, 07:20 PM

Quote:

Originally Posted by Tinsta

Have you got a jb4 installed too? As I'm sure the jb4 has a builtin a downpipe fix already as a feature.

No I do not... I've been buying parts are they come up for sale used, but JB4 is next on the list.

From my understanding JB4 has auto clear, but it wont allow you to pass smog / emission test (witch is why I bought the DP fix),

ianc · 12-11-2016, 08:37 PM

What do Burger have to say about it?

ianc

1and1 · 12-11-2016, 08:52 PM

Interesting, I would have expected a too rich code after removing that part which shall not be named. If you have an adjustable fix, and are getting codes for too lean, can you lighten up on the adjustment some?

2008135i · 12-11-2016, 09:02 PM

Quote:

Originally Posted by ianc

What do Burger have to say about it?

ianc

Well the Downpipe fix is a VRSF product and they are of no help. In fact, they sent me a link to the Burger Motorsports installation guide, lol.

2008135i · 12-11-2016, 09:05 PM

Quote:

Originally Posted by 1and1

Interesting, I would have expected a too rich code after removing that part which shall not be named. If you have an adjustable fix, and are getting codes for too lean, can you lighten up on the adjustment some?

Yes, I can adjust the DP fix, but I guess I'm just confused about why I'm still getting post cat o2 sensors swapped codes. That said maybe I should just adjust the DP fix, and see if it takes care of all 3 codes...

ODU135 · 12-12-2016, 05:16 PM

Quote:

Originally Posted by 2008135i

Yes, I can adjust the DP fix, but I guess I'm just confused about why I'm still getting post cat o2 sensors swapped codes. That said maybe I should just adjust the DP fix, and see if it takes care of all 3 codes...

I would try to adjust it and play around with it. If your first 150 miles or so didn't cause codes then you will probably be able to adjust so it won't cause codes. If not, then I guess you will just have an even better excuse to get a tune

spooled2 · 12-14-2016, 06:03 PM

Sounds like maybe you mixed up the plugs try swapping plugs at the connection?

2008135i · 01-03-2017, 04:28 PM

Update:

Well after adjusting the DPF for almost a month, I kept getting o2 signals swapped (even though they aren't, and swapping them anyways gave the same code) and codes for o2 signal stuck. It also has been shuttering / miss firing at lower rpm with partial throttle (never got a code for misfire).

So, I just removed the DPF and the codes have not appeared other than catalyst inefficient codes, and the car is running much better.

ShocknAwe · 01-03-2017, 08:31 PM

Think wedge sells a dp fix as well. You only need to have it installed if for smog, otherwise, virtually amy tune will take care of the dp codes for you.

ajoosten · 01-07-2017, 10:52 PM

I just installed the dpfix in December with no issues. Then after about a month it got cold and I am starting to throw the same codes as you. I'm thinking about uninstalling also.

12-11-2016, 01:14 PM	#1
2008135i Private 11 Rep 58 Posts Drives: 2008 135i Join Date: Nov 2016 Location: Milwaukee, WI iTrader: (0)	N54, downpipes and downpipe fix, now service light... Hey guys, Let me start by saying I did research this (so lets not freak out), and although I came up with some info, nothing as helped solve the issue. Car info: I have a 2008 135i, and just install the VRSF 3" downpipes and downpipe fix (installed via the Burger Motorsports installation guide), and I'm getting intermittent codes for P2098 (bank 2 post cat lean), P2096 (bank 1 post cat lean), and P0041 (Post cat O2 sensors swapped). Car seems to run, drive, and idle great. Issue frequency: I installed the downpipes and downpipe fix and ran the car for about 150 miles without issue, and now just stated getting issues. First time it happened I just cleared the codes and ran the car another 80+ miles without issue. Now it seems to throwing these codes about every 10 to 30 miles now. Corrective actions: Seeing as I keep getting the post cat o2 sensors swapped code I decided to swap them (even though I had them correct: black bank 1, grey bank 2). I still get the same 3 codes even after the swap. Suggestions? Any suggestions on what to try next? I was thinking of swapping the o2's back to the correct spots (black front, grey rear), and then try and remove the downpipe fix so see if its that.... Is it possible I just don't have the downpipe fix adjusted right, even though it drove fine for 150+ miles after the install? Thanks for any help!
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12-11-2016, 03:02 PM	#2
Tinsta Lieutenant 189 Rep 585 Posts Drives: 1CSL Join Date: Nov 2014 Location: UK iTrader: (2)	Have you got a jb4 installed too? As I'm sure the jb4 has a builtin a downpipe fix already as a feature. __________________ If its broke.. Mod it! if not, mod it anyway!
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12-11-2016, 08:37 PM	#4
ianc Ex '87 Carrera 246 Rep 1,259 Posts Drives: '10 TiAg 6MT 135i Join Date: Feb 2010 Location: Redwood Shores, California iTrader: (0)	What do Burger have to say about it? ianc
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12-11-2016, 08:52 PM	#5
1and1 Loves me some MHD! 1858 Rep 1,719 Posts Drives: faster than he should... Join Date: Jul 2016 Location: Tally, FL iTrader: (2) Garage List '09 135i [10.00]	Interesting, I would have expected a too rich code after removing that part which shall not be named. If you have an adjustable fix, and are getting codes for too lean, can you lighten up on the adjustment some? __________________ 1and1 135i - E82.N54 2009 BSM - MHD / xHP / DCI, PR CP & 7.5" Race IC / N55 mid & Borla . . WL RSFI, Koni, Eibach & Dinan CP's, M3 CA's / EBC Red's & Firehawk 500's X1 - E84.N20 2013 MGM - JB4 - The Wife's, now with new turbo & ewg
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12-14-2016, 06:03 PM	#9
spooled2 New Member 5 Rep 27 Posts Drives: BMW 135i Join Date: Jan 2015 Location: Howell Nj iTrader: (0)	Sounds like maybe you mixed up the plugs try swapping plugs at the connection?
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01-03-2017, 04:28 PM	#10
2008135i Private 11 Rep 58 Posts Drives: 2008 135i Join Date: Nov 2016 Location: Milwaukee, WI iTrader: (0)	Update: Well after adjusting the DPF for almost a month, I kept getting o2 signals swapped (even though they aren't, and swapping them anyways gave the same code) and codes for o2 signal stuck. It also has been shuttering / miss firing at lower rpm with partial throttle (never got a code for misfire). So, I just removed the DPF and the codes have not appeared other than catalyst inefficient codes, and the car is running much better.
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01-03-2017, 08:31 PM	#11
ShocknAwe 1Addict 3234 Rep 7,894 Posts Drives: E82 Mutt, M57 Truck Join Date: Jul 2012 Location: Charleston iTrader: (22)	Think wedge sells a dp fix as well. You only need to have it installed if for smog, otherwise, virtually amy tune will take care of the dp codes for you. __________________ 2010 135i 6MT Jet Black N54/3 FE82 Mutt \| BUILD THREAD \| GARAGE SALE
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01-07-2017, 10:52 PM	#12
ajoosten Enlisted Member 9 Rep 44 Posts Drives: 2009 135i \| https://bmw135iblo Join Date: Nov 2016 Location: Fort Worth, TX iTrader: (0)	I just installed the dpfix in December with no issues. Then after about a month it got cold and I am starting to throw the same codes as you. I'm thinking about uninstalling also.
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