E90Post
 


Extreme Powerhouse
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Service Engine Soon: Code 29f5 (cat issue)



Reply
 
Thread Tools Search this Thread
      05-17-2015, 01:46 PM   #1
mmmnot
Custom User Title
mmmnot's Avatar
Iran
402
Rep
1,344
Posts

Drives: E92 328i
Join Date: Mar 2015
Location: Hotlanta

iTrader: (2)

Service Engine Soon: Code 29f5 (cat issue)

Hello all.

I have been getting a service engine light soon. Upon scanning with the Bav tool, I pulled up this error code: 29f5

Image:


I have AFE Catted primary headers and 2nd cat delete.

This is the second time I've had to run this code in the past month. Prior, I had one more similar issue, but it was after a dyno run (with headers/post 2nd delete) about 4 months ago.

There are no rear sensors and AFE claims no issues, so I have a few possibilities:

A.) sensors are bad due to higher flow?
B.) bad gas?
C.) o2 sensor is not properly seated or in the middle to get an accurate flow reading

Does anybody have an idea where I should start? Would this cause emissions issues in a fairly liberal state, eg NOT CA.?

My gut says just toss a spacer between the o2 bolt to center it more...

Can o2 sensors be cleaned? If so, is it advised vs. just replacing?

Any guidance or help is greatly appreciated.

Thanks!

PS, I did search and found a thread here http://www.e90post.com/forums/showthread.php?t=555468 but it seemed to offer no real solution with the above modifications.
__________________
Appreciate 0
      05-18-2015, 08:46 PM   #2
MarkkyyMan
Captain
MarkkyyMan's Avatar
United_States
30
Rep
714
Posts

Drives: 2010 BMW 128i
Join Date: Dec 2009
Location: Indiana, U.S.

iTrader: (0)

29F5= Catalyst System Efficiency Below Threshold (Bank 2)
Appreciate 0
      05-18-2015, 09:02 PM   #3
SDemetris
FSAE Dude
United_States
54
Rep
765
Posts

Drives: E90 328xi
Join Date: Jul 2012
Location: Pittsburgh, PA

iTrader: (0)

What do you mean there are no rear sensors.. there absolutely are
Appreciate 0
      05-19-2015, 08:30 AM   #4
mmmnot
Custom User Title
mmmnot's Avatar
Iran
402
Rep
1,344
Posts

Drives: E92 328i
Join Date: Mar 2015
Location: Hotlanta

iTrader: (2)

Quote:
Originally Posted by SDemetris View Post
What do you mean there are no rear sensors.. there absolutely are
Sorry, I meant secondary cat sensors?
__________________
Appreciate 0
      05-19-2015, 01:40 PM   #5
thomas88162
Lieutenant
19
Rep
597
Posts

Drives: E92 328i
Join Date: Jun 2013
Location: Clinton, IN

iTrader: (0)

The rear O2 sensors (post-cat) ARE what sets these codes, they compare the fuel content to the reading from the pre-cat O2 sensors. Assuming that you mean there are no rear O2 sensors, you either need to tune accordingly or get yourself some.
Appreciate 0
      05-19-2015, 02:00 PM   #6
mmmnot
Custom User Title
mmmnot's Avatar
Iran
402
Rep
1,344
Posts

Drives: E92 328i
Join Date: Mar 2015
Location: Hotlanta

iTrader: (2)

Quote:
Originally Posted by thomas88162 View Post
The rear O2 sensors (post-cat) ARE what sets these codes, they compare the fuel content to the reading from the pre-cat O2 sensors. Assuming that you mean there are no rear O2 sensors, you either need to tune accordingly or get yourself some.
OK, maybe I am confused. Let me rephrase here:

Both of my primary cats are in place with sensors.

However, I did delete secondary cats which has no sensors or wires plugged into them.

Does your above comment still apply or did I just confuse everybody with my wording?
__________________
Appreciate 0
      05-19-2015, 02:03 PM   #7
Ali-323i
Colonel
Ali-323i's Avatar
Canada
342
Rep
2,291
Posts

Drives: 2007 E90 323i (Cdn)
Join Date: May 2013
Location: Toronto, Canada

iTrader: (3)

Garage List
2007 BMW 323i  [4.25]
I'm a bit confused by the earlier post also... I always thought that there were no sensors after the 2ndary cats, meaning they could be deleted without worry of any codes.

Is this assumption incorrect?
__________________
Appreciate 0
      05-19-2015, 02:11 PM   #8
mmmnot
Custom User Title
mmmnot's Avatar
Iran
402
Rep
1,344
Posts

Drives: E92 328i
Join Date: Mar 2015
Location: Hotlanta

iTrader: (2)

Quote:
Originally Posted by Ali-323i View Post
I'm a bit confused by the earlier post also... I always thought that there were no sensors after the 2ndary cats, meaning they could be deleted without worry of any codes.

Is this assumption incorrect?
Right. That's what I assumed/knew based on research:

Primary, back diagram indicates no wires, and I can confirm this as I did the install with the 2nd cat delete:



No. 2 in the above diagram.

While my AFE headers retained all of the sensors from the below diagram:



Vs AFE header:



Which have the same placement (or similar) of sensors.

It's worth noting I've driven over 100 miles since my last code deletion with no more errors. It seems to be very, very random...
__________________
Appreciate 0
      05-21-2015, 01:00 AM   #9
thomas88162
Lieutenant
19
Rep
597
Posts

Drives: E92 328i
Join Date: Jun 2013
Location: Clinton, IN

iTrader: (0)

Okay, now I understand. You just deleted secondary cats, but have pre and post cat sensors for the primary(there are no sensors for the secondary). I was sort of confused as to whether you were missing O2 sensors. Placement of the O2 bung could cause an issue like this, but I wouldn't think AFE would have such an issue.

Last edited by thomas88162; 05-21-2015 at 02:02 AM..
Appreciate 0
      05-21-2015, 07:38 AM   #10
mmmnot
Custom User Title
mmmnot's Avatar
Iran
402
Rep
1,344
Posts

Drives: E92 328i
Join Date: Mar 2015
Location: Hotlanta

iTrader: (2)

Quote:
Originally Posted by thomas88162 View Post
Okay, now I understand. You just deleted secondary cats, but have pre and post cat sensors for the primary(there are no sensors for the secondary). I was sort of confused as to whether you were missing O2 sensors. Placement of the O2 bung could cause an issue like this, but I wouldn't think AFE would have such an issue.
Yeah, sorry for my mis-wording.

Anybody have any ideas where to start looking?

Is it advisable to clean the o2 sensor, if so, what's a proper product?
__________________
Appreciate 0
      05-21-2015, 11:46 PM   #11
thomas88162
Lieutenant
19
Rep
597
Posts

Drives: E92 328i
Join Date: Jun 2013
Location: Clinton, IN

iTrader: (0)

Usually if O2's are bad they are simply bad, no cleaning would work. But, I see no reason why yours would be defect so soon other than installation damage.
Appreciate 0
      05-22-2015, 08:26 AM   #12
mmmnot
Custom User Title
mmmnot's Avatar
Iran
402
Rep
1,344
Posts

Drives: E92 328i
Join Date: Mar 2015
Location: Hotlanta

iTrader: (2)

Quote:
Originally Posted by thomas88162 View Post
Usually if O2's are bad they are simply bad, no cleaning would work. But, I see no reason why yours would be defect so soon other than installation damage.
Thank you for that information. It has yet to pop back up. I'm going to assume it's just bad gas. I'll have my local shop take a peek at it during my next oil change.

Just wanted to see if it was something obvious I might be neglecting.
__________________
Appreciate 0
      04-30-2021, 07:13 PM   #13
xavi718
New Member
xavi718's Avatar
United_States
0
Rep
8
Posts

Drives: 2006-330xi
Join Date: Dec 2018
Location: New York - Queens

iTrader: (0)

Quote:
Originally Posted by mmmnot View Post
Thank you for that information. It has yet to pop back up. I'm going to assume it's just bad gas. I'll have my local shop take a peek at it during my next oil change.

Just wanted to see if it was something obvious I might be neglecting.
Did you solve your problem? After I installed my AFE HEADERS 4 months after i get the service engine soon .

.
Appreciate 0
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 07:33 AM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, 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