ZPOST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   ZPOST > BMW Z4 Technical Talk > Engine, Exhaust, Drivetrain Modifications
  TireRack

SUPPORT ZPOST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS!
Post Reply
 
Thread Tools Search this Thread
      10-25-2009, 11:24 AM   #1
rcodea
Private First Class
United_States
17
Rep
104
Posts

Drives: 19 M2C
Join Date: May 2009
Location: Goodyear, AZ

iTrader: (0)

code P2096?!...ESS and RPI mods, still there!

while cruising from Columbia to Charlotte last night for the 'Shinedown' concert, light kicked on. the pocked scanner shows code P2096; 'lean post cat'. mod list is below. no performance change noticed

ESS flash with the catless/header/o2 delete and exhaust option
stock cats/header still installed
RPI scoop/filter installed after flash
RPI axleback exhaust after flash

car is a '06 Z4MR with 74k miles(first owner put ~70k in just 18 months). I know that the vavles need to be adjusted, along with the inspection2 and wheel alignment.

i have had no issues with the car, minus this code.

any ideas? thoughts?

~Ryan

Last edited by rcodea; 11-05-2009 at 03:30 PM..
Appreciate 0
      10-25-2009, 08:25 PM   #2
E82tt6
Colonel
E82tt6's Avatar
103
Rep
2,626
Posts

Drives: '08 Black Saphire Z4 MC
Join Date: Oct 2007
Location: New Jersey

iTrader: (0)

That's an O2 sensor issue, whatever you're using to turn off the catless code is not working properly, or needs to be adjusted.
__________________
'08 Black Saphire/Black Z4 M Coupe
RIP Gretta: Blue Water/Lemon 135i. Died to save me.
-ChuckV
Appreciate 0
      10-26-2009, 05:14 AM   #3
rcodea
Private First Class
United_States
17
Rep
104
Posts

Drives: 19 M2C
Join Date: May 2009
Location: Goodyear, AZ

iTrader: (0)

i have nothing to trun off the catless code...all cats and O2 sensors are installed and working.

~Ryan
Appreciate 0
      10-26-2009, 10:42 AM   #4
sales@ESSTuning
sales@ESSTuning's Avatar
389
Rep
3,149
Posts

Drives: ESS M3 / M4
Join Date: May 2007
Location: AZ

iTrader: (6)

P2096(post catalyst fuel trim system too lean bank 1)

It could be a few things. A bad or dirty MAF or intake turbulence issue from non OEM intake or Bad secondary O2 sensor.
Appreciate 0
      10-26-2009, 12:10 PM   #5
rcodea
Private First Class
United_States
17
Rep
104
Posts

Drives: 19 M2C
Join Date: May 2009
Location: Goodyear, AZ

iTrader: (0)

Quote:
Originally Posted by Rom3n View Post
P2096(post catalyst fuel trim system too lean bank 1)

It could be a few things. A bad or dirty MAF or intake turbulence issue from non OEM intake or Bad secondary O2 sensor.
no issue then with the flash and keeping the headers/cats/O2 sensors?

i'll look into cleaning the MAF. any way to trouble shoot for a bad MAF? possibly bechcheck for resistances?

Intake is OEM, minus the scoop and filter. I have not read any such issues using these parts together.

anyone know of a way to troubleshoot for a possible bad secondary O2? given the flash, can i just disconect secondary O2 and forget about it?

~Ryan
Appreciate 0
      10-26-2009, 02:32 PM   #6
sales@ESSTuning
sales@ESSTuning's Avatar
389
Rep
3,149
Posts

Drives: ESS M3 / M4
Join Date: May 2007
Location: AZ

iTrader: (6)

Quote:
Originally Posted by rcodea View Post
no issue then with the flash and keeping the headers/cats/O2 sensors?

i'll look into cleaning the MAF. any way to trouble shoot for a bad MAF? possibly bechcheck for resistances?

Intake is OEM, minus the scoop and filter. I have not read any such issues using these parts together.

anyone know of a way to troubleshoot for a possible bad secondary O2? given the flash, can i just disconect secondary O2 and forget about it?

~Ryan
Ryan

Try to clean off the MAF with CFR MAF cleaner and have the code cleared. This is most likely your issue and the code should stay off. You do not want to disconect the 02 sensors.
Appreciate 0
      10-26-2009, 05:01 PM   #7
DarkstarZero
Lieutenant Colonel
DarkstarZero's Avatar
United_States
1014
Rep
1,719
Posts

Drives: Daytona 95 M3, X7 M50, e92 M3,
Join Date: Nov 2007
Location: Washington DC

iTrader: (6)

I had a similar problem on my old 95 M3. Some reading would go outside the levels the computer wants to see for just a short period of time and it would throw the O2 sensor error. Even after the reading returns to normal the Check Engine light stays on until after so many cold restarts, then it turns off. I didn't invest any time in it because it only came on every other month and was on for just a few days.
__________________
BMW CCA Track Instructor
Join to win a M School Day at the Performance Center!
Enter Referral ID: 420186
Appreciate 0
      10-26-2009, 07:25 PM   #8
rcodea
Private First Class
United_States
17
Rep
104
Posts

Drives: 19 M2C
Join Date: May 2009
Location: Goodyear, AZ

iTrader: (0)

thanks guys, i'll try it out and report results.

~Ryan
Appreciate 0
      11-02-2009, 03:45 PM   #9
Z-Four
New Member
1
Rep
8
Posts

Drives: Z4 3.0i
Join Date: Aug 2008
Location: Austin, Texas

iTrader: (0)

Just FYI, I have headers no cats in my car and until I put my o2 sim in I was getting p2096 and p2098 as well as the catalyst inefficiency codes. The only way I was able to clear those codes (p2096 & p2098) was to do a full adaptations reset or else they would just come back after exactly two driving sessions. It took me a good two weeks of wondering why my o2 sim wasn't working until l discovered that. So even if you have your DME re flashed to disregard your rear o2's you may still need to have your adaptions reset untill those codes will go away.
__________________
Appreciate 0
      11-02-2009, 03:56 PM   #10
JCz04Bimmer
Captain
JCz04Bimmer's Avatar
30
Rep
606
Posts

Drives: 06 Z4MC
Join Date: Feb 2008
Location: New York City

iTrader: (2)

Quote:
Originally Posted by Z-Four View Post
Just FYI, I have headers no cats in my car and until I put my o2 sim in I was getting p2096 and p2098 as well as the catalyst inefficiency codes. The only way I was able to clear those codes (p2096 & p2098) was to do a full adaptations reset or else they would just come back after exactly two driving sessions. It took me a good two weeks of wondering why my o2 sim wasn't working until l discovered that. So even if you have your DME re flashed to disregard your rear o2's you may still need to have your adaptions reset untill those codes will go away.
Good advise. Pulling the battery connections for 15 minutes should reset most adaptations and will allow you ECU to adjust more airflow across the MAF. That said, that pesky MAF is finicky as hell. Be VERY careful removing and installing it for cleaning. I've definitely broken one just trying to clean it and it ain't cheap...
__________________
|www.onehotlap.com|Real People|Real Cars|
Appreciate 0
      11-02-2009, 05:05 PM   #11
Z-Four
New Member
1
Rep
8
Posts

Drives: Z4 3.0i
Join Date: Aug 2008
Location: Austin, Texas

iTrader: (0)

Quote:
Originally Posted by JCz04Bimmer View Post
Good advise. Pulling the battery connections for 15 minutes should reset most adaptations and will allow you ECU to adjust more airflow across the MAF. That said, that pesky MAF is finicky as hell. Be VERY careful removing and installing it for cleaning. I've definitely broken one just trying to clean it and it ain't cheap...
Unfortunately disconnecting the battery will not reset adaptation values in the DME. It has to be done with a scan tool capable of communicating with the DME on a dealer level. I really wish it was as easy as disconnecting the battery
__________________
Appreciate 0
      11-04-2009, 09:27 PM   #12
rcodea
Private First Class
United_States
17
Rep
104
Posts

Drives: 19 M2C
Join Date: May 2009
Location: Goodyear, AZ

iTrader: (0)

ok, so after cleaning the MAF, and driving it, the code cleared without going to the dealer.

It came back tonight; 55mph, 2400rpm, 5th gear on a level road.

i'll try cleaning it again. next will be the dealer to have the adaptions reset completely reset. any other ideas?

i am not familure with the adaptation values issue, do i need to tell the dealer something specific to get them cleared? is there anyone else that can do this asside from the dealer...not a big fan of my dealer!

~Ryan

Last edited by rcodea; 11-05-2009 at 03:31 PM..
Appreciate 0
      11-08-2009, 07:06 PM   #13
rcodea
Private First Class
United_States
17
Rep
104
Posts

Drives: 19 M2C
Join Date: May 2009
Location: Goodyear, AZ

iTrader: (0)

CODES ARE BACK!

now throwing a 'p2098' and 'p0041' for codes...both pointing again to the second bank O2 sensor.

since the 'p2096', i did the following
-cleaned MAF using MAF cleaner spray
-dealer did vavle adjustment
-dealer cleared the adaptive values
-dealer cleared the 'p2096' code
-dealer did oil change

i have put ~100 miles on the car since the dealer performed the above

the code keeps throwing while cruising, not when driving aggressively or around town.

any other ideas guys?

~Ryan
Appreciate 0
      11-09-2009, 08:23 AM   #14
O-cha
Brigadier General
O-cha's Avatar
218
Rep
4,726
Posts

Drives: Mcoupe
Join Date: Oct 2007
Location: In front of you

iTrader: (2)

Quote:
Originally Posted by JCz04Bimmer View Post
Good advise. Pulling the battery connections for 15 minutes should reset most adaptations and will allow you ECU to adjust more airflow across the MAF. That said, that pesky MAF is finicky as hell. Be VERY careful removing and installing it for cleaning. I've definitely broken one just trying to clean it and it ain't cheap...
It absolutely does not, I can read the adaptions and tell you this with certainty.
__________________
Appreciate 0
      11-09-2009, 09:50 AM   #15
laidback
Lieutenant Colonel
134
Rep
1,709
Posts

Drives: M's
Join Date: Jul 2007
Location: SoCal

iTrader: (0)

Did you change your O2 sensors? if not...time for a replacement
Quote:
Originally Posted by rcodea View Post
CODES ARE BACK!

now throwing a 'p2098' and 'p0041' for codes...both pointing again to the second bank O2 sensor.

since the 'p2096', i did the following
-cleaned MAF using MAF cleaner spray
-dealer did vavle adjustment
-dealer cleared the adaptive values
-dealer cleared the 'p2096' code
-dealer did oil change

i have put ~100 miles on the car since the dealer performed the above

the code keeps throwing while cruising, not when driving aggressively or around town.

any other ideas guys?

~Ryan
__________________
Live as if you will die tomorrow, but learn as if you will live forever." M.G
<img src=http://i251.photobucket.com/albums/gg289/l8dback/2012/ff8d7019.png border=0 alt= />
Appreciate 0
      11-09-2009, 01:10 PM   #16
rcodea
Private First Class
United_States
17
Rep
104
Posts

Drives: 19 M2C
Join Date: May 2009
Location: Goodyear, AZ

iTrader: (0)

i had the p2098 and p0041 cleared last night using a handheld from the local parts store(i pushed the buttons of course). put 45 miles on it since, no other lights yet, but i expect they will come back tonight.

Quote:
Did you change your O2 sensors? if not...time for a replacement
thats what i am thinking, but wanted to make sure there was not something i can do to troubleshoot them first. additionally, which ones do i need to replace? here is the realOEM.com link to the header sensors....

http://www.realoem.com/bmw/showparts...64&hg=18&fg=10

~Ryan
Appreciate 0
      03-30-2010, 04:12 PM   #17
kav
Lieutenant
Canada
47
Rep
401
Posts

Drives: Z4M
Join Date: Oct 2007
Location: Canada

iTrader: (1)

Any updates on this?
Appreciate 0
      05-21-2010, 07:06 PM   #18
rcodea
Private First Class
United_States
17
Rep
104
Posts

Drives: 19 M2C
Join Date: May 2009
Location: Goodyear, AZ

iTrader: (0)

had to replace the sensors(all 4) and reset the adaption codes too. all is well now.

~Ryan
Appreciate 0
      05-21-2010, 08:12 PM   #19
fatmatt0116
Hooligan
fatmatt0116's Avatar
United_States
55
Rep
680
Posts

Drives: 2014 Porsche Cayenne Turbo S
Join Date: Dec 2008
Location: Boston, MA

iTrader: (0)

Is it possible to pass a california emissions test with headers and ess tune?
__________________

2014 Porsche Cayenne Turbo S
2011 X5 5.0 Dinan - SOLD
2007 Imola Red Z4 M Coupe -SOLD
2004 Navy Blue BMW 325Ci
Appreciate 0
      05-22-2010, 09:05 AM   #20
mousitch
Dark Sider
mousitch's Avatar
127
Rep
1,777
Posts

Drives: 2008 Space Gray Z4MC
Join Date: Jan 2010
Location: Missouri

iTrader: (11)

Garage List
2008 Z4M Coupe  [7.50]
Quote:
Originally Posted by fatmatt0116 View Post
Is it possible to pass a california emissions test with headers and ess tune?
I'd say it would be really difficult.
__________________
[URL=http://imageshack.us/photo/my-images/153/071jt.jpg/]
2008 Space Grey M Coupe-RPI Scoop-Gruppe M CAI-Eisenmann Race Cans-RE X-pipe-ECU Remap-H&R Sport springs-Zeck CDV delete-Stock Gloss black powder coated wheels-LED Tekarbon Angel Eyes Project-Michelin Super Sports-Hardwired Uniden R7-H&R front and rear spacers-Alarm module added-stereo amp recoded to vert settings
Appreciate 0
      05-22-2010, 10:22 AM   #21
Getssum96
Private
United_States
0
Rep
58
Posts

Drives: TBD
Join Date: Mar 2008
Location: Earth

iTrader: (0)

Care to elaborate on this? ^^^^^

Most cars with Headers run cleaner than stock, and the ess tune isn't a "Dirty" one from what I understand.

Most smog tech have NO idea what they're looking for, except the obvious ones!

Most have NEVER seen our cars so ???
Appreciate 0
      05-22-2010, 02:07 PM   #22
fatmatt0116
Hooligan
fatmatt0116's Avatar
United_States
55
Rep
680
Posts

Drives: 2014 Porsche Cayenne Turbo S
Join Date: Dec 2008
Location: Boston, MA

iTrader: (0)

I think even with the ESS fix the computer still throws a code which gets read by the computer when you take it in for inspection. Is there any way around this?
__________________

2014 Porsche Cayenne Turbo S
2011 X5 5.0 Dinan - SOLD
2007 Imola Red Z4 M Coupe -SOLD
2004 Navy Blue BMW 325Ci
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 10:04 AM.




zpost
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST