F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > O2 sensor codes
Studio RSR
Post Reply
 
Thread Tools Search this Thread
      10-09-2021, 07:02 PM   #1
Logicoeur
Lieutenant Colonel
Logicoeur's Avatar
988
Rep
1,934
Posts

Drives: F30 335i xDrive
Join Date: Feb 2018
Location: Boston

iTrader: (0)

O2 sensor codes

Chasing down the cause of an active CEL for the front o2 sensor. I've been able to get voltage reading for the sensor using BimmerLink, but I'm not versed enough to understand what the voltage reading is against it's resistance.

I logged a 3-2-3-4 run today to see if anything appears in the logs. Running a non-guaranteed catted dp, Vrsf competition IC, and Mhd 2+ 93oct.

Log and code attached
https://datazap.me/u/logicoeur/10-9?...#38;zoom=0-353


Googling the specific code and text, I have found users with loose o2 connectors on installation, or just come to the conclusion they have to replace the sensor. It's not a cat efficiency code. I keep clearing it and it returns on the next start. Connectors are correctly plugged and secure (triple checked).

Is anyone able to tell from the datazap whether it is indeed a bad wideband sensor?
Attached Images
 
__________________
F30 335iX | Remus Axleback | Fabspeed Catted DP | VRSF Comp IC | 18X9 ET35 19lb MT1 | 255/40/18 ECS | Ohlins RT Millway Street | Millway Control Arm Bushings | Turner Endlinks | TMH 75mm 14x1.5 Studs | BMW MPerf LSD | XDelete | Pipercross Filter | MHD Stg2 93
Appreciate 0
      10-09-2021, 11:48 PM   #2
n55david
Check out my Youtube @n55david!
n55david's Avatar
1288
Rep
3,502
Posts

Drives: 2017 m240i, 2015 X3 x35i
Join Date: Aug 2018
Location: Michigan USA

iTrader: (0)

Garage List
2017 m240i xDrive  [0.00]
2015 X3 x35i  [0.00]
2015 335i xdrive  [0.00]
02 is unplugged or there isna break in the wire(s)
__________________
2017 m240i xDrive 10.99@122.86mph bootmod3 stage 2+ ots
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD
2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots
IG: @n55david For pics and updates!
Youtube: @ n55david For videos or Racing etc
Appreciate 0
      10-10-2021, 09:46 PM   #3
Logicoeur
Lieutenant Colonel
Logicoeur's Avatar
988
Rep
1,934
Posts

Drives: F30 335i xDrive
Join Date: Feb 2018
Location: Boston

iTrader: (0)

Quote:
Originally Posted by Phantom10R View Post
02 is unplugged or there isna break in the wire(s)
This is what my buddy and my own google searching indicates. I unplugged and plugged it a few times, even attempted to swap the two plugs just to rule out installation. However those Germans thought of everything because they are keyed one way.

I guess I do have to get a new o2 sensor installed . The stack of maintenance receipts is growing.
__________________
F30 335iX | Remus Axleback | Fabspeed Catted DP | VRSF Comp IC | 18X9 ET35 19lb MT1 | 255/40/18 ECS | Ohlins RT Millway Street | Millway Control Arm Bushings | Turner Endlinks | TMH 75mm 14x1.5 Studs | BMW MPerf LSD | XDelete | Pipercross Filter | MHD Stg2 93
Appreciate 0
      10-11-2021, 03:19 AM   #4
n55david
Check out my Youtube @n55david!
n55david's Avatar
1288
Rep
3,502
Posts

Drives: 2017 m240i, 2015 X3 x35i
Join Date: Aug 2018
Location: Michigan USA

iTrader: (0)

Garage List
2017 m240i xDrive  [0.00]
2015 X3 x35i  [0.00]
2015 335i xdrive  [0.00]
Quote:
Originally Posted by Logicoeur View Post
Quote:
Originally Posted by Phantom10R View Post
02 is unplugged or there isna break in the wire(s)
This is what my buddy and my own google searching indicates. I unplugged and plugged it a few times, even attempted to swap the two plugs just to rule out installation. However those Germans thought of everything because they are keyed one way.

I guess I do have to get a new o2 sensor installed . The stack of maintenance receipts is growing.
swapping them wouldn't have mattered anyway since they are different types of sensors. if you were able to just swap them the car would have freaked out since it wouldn't have been able to control fueling anymore.
__________________
2017 m240i xDrive 10.99@122.86mph bootmod3 stage 2+ ots
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD
2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots
IG: @n55david For pics and updates!
Youtube: @ n55david For videos or Racing etc
Appreciate 0
      10-11-2021, 11:36 AM   #5
thejeremyman9
Major General
thejeremyman9's Avatar
4343
Rep
7,555
Posts

Drives: 2015 BMW 335i
Join Date: May 2019
Location: Cali

iTrader: (0)

It's hard to tell anything from the log because at part throttle your target AFR is constant but your fuel trims don't move. I would also suggest it is the O2 sensor or its wiring.
Appreciate 0
      10-11-2021, 11:46 AM   #6
Logicoeur
Lieutenant Colonel
Logicoeur's Avatar
988
Rep
1,934
Posts

Drives: F30 335i xDrive
Join Date: Feb 2018
Location: Boston

iTrader: (0)

Quote:
Originally Posted by thejeremyman9 View Post
It's hard to tell anything from the log because at part throttle your target AFR is constant but your fuel trims don't move. I would also suggest it is the O2 sensor or its wiring.
This is what I was looking for. I believed that there was some stream or function of streams that would indicate something is wrong with input from the sensor. From the docs it did say when the sensor fails the DME falls back to a constant value as a failsafe or something or other. Cool!
__________________
F30 335iX | Remus Axleback | Fabspeed Catted DP | VRSF Comp IC | 18X9 ET35 19lb MT1 | 255/40/18 ECS | Ohlins RT Millway Street | Millway Control Arm Bushings | Turner Endlinks | TMH 75mm 14x1.5 Studs | BMW MPerf LSD | XDelete | Pipercross Filter | MHD Stg2 93
Appreciate 0
      10-11-2021, 12:13 PM   #7
n55david
Check out my Youtube @n55david!
n55david's Avatar
1288
Rep
3,502
Posts

Drives: 2017 m240i, 2015 X3 x35i
Join Date: Aug 2018
Location: Michigan USA

iTrader: (0)

Garage List
2017 m240i xDrive  [0.00]
2015 X3 x35i  [0.00]
2015 335i xdrive  [0.00]
Quote:
Originally Posted by Logicoeur View Post
Quote:
Originally Posted by thejeremyman9 View Post
It's hard to tell anything from the log because at part throttle your target AFR is constant but your fuel trims don't move. I would also suggest it is the O2 sensor or its wiring.
This is what I was looking for. I believed that there was some stream or function of streams that would indicate something is wrong with input from the sensor. From the docs it did say when the sensor fails the DME falls back to a constant value as a failsafe or something or other. Cool!
if its just the heater the sensor may be work but they need to be at a certain operating temp to work properly. so it may or may bit be using the values it sees for a longer period of time or if even at all.

so it didn't matter if the log showed anything, it needs to be replaced.
__________________
2017 m240i xDrive 10.99@122.86mph bootmod3 stage 2+ ots
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD
2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots
IG: @n55david For pics and updates!
Youtube: @ n55david For videos or Racing etc
Appreciate 0
      10-11-2021, 12:26 PM   #8
thejeremyman9
Major General
thejeremyman9's Avatar
4343
Rep
7,555
Posts

Drives: 2015 BMW 335i
Join Date: May 2019
Location: Cali

iTrader: (0)

Quote:
Originally Posted by Logicoeur View Post
This is what I was looking for. I believed that there was some stream or function of streams that would indicate something is wrong with input from the sensor. From the docs it did say when the sensor fails the DME falls back to a constant value as a failsafe or something or other. Cool!
Yup just open the log and turn off everything (including RPM), then 1 at a time turn on labmda bank 1 AFR, STFT, and LTFTs. Leave only 1 on at a time. You can see they arent right.
Appreciate 1
n55david1288.00
      10-11-2021, 12:35 PM   #9
n55david
Check out my Youtube @n55david!
n55david's Avatar
1288
Rep
3,502
Posts

Drives: 2017 m240i, 2015 X3 x35i
Join Date: Aug 2018
Location: Michigan USA

iTrader: (0)

Garage List
2017 m240i xDrive  [0.00]
2015 X3 x35i  [0.00]
2015 335i xdrive  [0.00]
Quote:
Originally Posted by thejeremyman9 View Post
Quote:
Originally Posted by Logicoeur View Post
This is what I was looking for. I believed that there was some stream or function of streams that would indicate something is wrong with input from the sensor. From the docs it did say when the sensor fails the DME falls back to a constant value as a failsafe or something or other. Cool!
Yup just open the log and turn off everything (including RPM), then 1 at a time turn on labmda bank 1 AFR, STFT, and LTFTs. Leave only 1 on at a time. You can see they arent right.
I'm just imaging that it's set to a certain estimate for filing but he's basically running the equivalent of no 02 sensor.

OP,

I'd drive it as little as possible till you get it fixed.
__________________
2017 m240i xDrive 10.99@122.86mph bootmod3 stage 2+ ots
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD
2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots
IG: @n55david For pics and updates!
Youtube: @ n55david For videos or Racing etc
Appreciate 0
      10-11-2021, 12:41 PM   #10
Logicoeur
Lieutenant Colonel
Logicoeur's Avatar
988
Rep
1,934
Posts

Drives: F30 335i xDrive
Join Date: Feb 2018
Location: Boston

iTrader: (0)

Quote:
Originally Posted by thejeremyman9 View Post
Quote:
Originally Posted by Logicoeur View Post
This is what I was looking for. I believed that there was some stream or function of streams that would indicate something is wrong with input from the sensor. From the docs it did say when the sensor fails the DME falls back to a constant value as a failsafe or something or other. Cool!
Yup just open the log and turn off everything (including RPM), then 1 at a time turn on labmda bank 1 AFR, STFT, and LTFTs. Leave only 1 on at a time. You can see they arent right.
I did this actually! I tried watching stft and ltft but nothing moved while driving around or on the gas, so I pulled the entire log hoping the behavior would be more apparent with some context. Thanks
__________________
F30 335iX | Remus Axleback | Fabspeed Catted DP | VRSF Comp IC | 18X9 ET35 19lb MT1 | 255/40/18 ECS | Ohlins RT Millway Street | Millway Control Arm Bushings | Turner Endlinks | TMH 75mm 14x1.5 Studs | BMW MPerf LSD | XDelete | Pipercross Filter | MHD Stg2 93
Appreciate 0
      10-11-2021, 12:42 PM   #11
thejeremyman9
Major General
thejeremyman9's Avatar
4343
Rep
7,555
Posts

Drives: 2015 BMW 335i
Join Date: May 2019
Location: Cali

iTrader: (0)

Quote:
Originally Posted by Phantom10R View Post
I'm just imaging that it's set to a certain estimate for filing but he's basically running the equivalent of no 02 sensor.

OP,

I'd drive it as little as possible till you get it fixed.
Yeah looks like he is running open loop. It's probably conservatively rich (usually fuel tables are) but definitely wouldnt do WOT pulls or anything.
Appreciate 0
      10-12-2021, 10:16 AM   #12
5w20
@_sunbish
5w20's Avatar
275
Rep
604
Posts

Drives: Bmw 435i & 340i
Join Date: Mar 2019
Location: Houston

iTrader: (0)

Quote:
Originally Posted by Logicoeur View Post
Chasing down the cause of an active CEL for the front o2 sensor. I've been able to get voltage reading for the sensor using BimmerLink, but I'm not versed enough to understand what the voltage reading is against it's resistance.

I logged a 3-2-3-4 run today to see if anything appears in the logs. Running a non-guaranteed catted dp, Vrsf competition IC, and Mhd 2+ 93oct.

Log and code attached
https://data.me/u/logicoeur/10-9?log...-19&zoom=0-353


Googling the specific code and text, I have found users with loose o2 connectors on installation, or just come to the conclusion they have to replace the sensor. It's not a cat efficiency code. I keep clearing it and it returns on the next start. Connectors are correctly plugged and secure (triple checked).

Is anyone able to tell from the datazap whether it is indeed a bad wideband sensor?
Had the same code but for the secondary o2 sensor. Replace your sensor.

https://f30.bimmerpost.com/forums/sh....php?t=1784694
Appreciate 1
Logicoeur988.00
      10-12-2021, 10:20 AM   #13
Logicoeur
Lieutenant Colonel
Logicoeur's Avatar
988
Rep
1,934
Posts

Drives: F30 335i xDrive
Join Date: Feb 2018
Location: Boston

iTrader: (0)

Quote:
Originally Posted by thejeremyman9 View Post
Quote:
Originally Posted by Phantom10R View Post
I'm just imaging that it's set to a certain estimate for filing but he's basically running the equivalent of no 02 sensor.

OP,

I'd drive it as little as possible till you get it fixed.
Yeah looks like he is running open loop. It's probably conservatively rich (usually fuel tables are) but definitely wouldnt do WOT pulls or anything.
I did one pull to 6 from 3 for the log above, but that was it. I've never revved the car up that much anyhow 😅. With MHD I may also be getting an extra conservative fuel map in open loop. I believe that mhd is a lot more deliberate with their failsafes than some other tuners, just from reading around here.
__________________
F30 335iX | Remus Axleback | Fabspeed Catted DP | VRSF Comp IC | 18X9 ET35 19lb MT1 | 255/40/18 ECS | Ohlins RT Millway Street | Millway Control Arm Bushings | Turner Endlinks | TMH 75mm 14x1.5 Studs | BMW MPerf LSD | XDelete | Pipercross Filter | MHD Stg2 93
Appreciate 0
      10-12-2021, 10:22 AM   #14
Logicoeur
Lieutenant Colonel
Logicoeur's Avatar
988
Rep
1,934
Posts

Drives: F30 335i xDrive
Join Date: Feb 2018
Location: Boston

iTrader: (0)

Part is ordered and on the way from FCP. If it happens again; life time warranty. Scheduled to replace it this Friday. Hopefully it makes the tune feel more powerful. Right now I feel like I am back at stock power/torque after going FBO on my pwg. Felt like a waste of a few grand
__________________
F30 335iX | Remus Axleback | Fabspeed Catted DP | VRSF Comp IC | 18X9 ET35 19lb MT1 | 255/40/18 ECS | Ohlins RT Millway Street | Millway Control Arm Bushings | Turner Endlinks | TMH 75mm 14x1.5 Studs | BMW MPerf LSD | XDelete | Pipercross Filter | MHD Stg2 93
Appreciate 0
      10-12-2021, 11:30 AM   #15
thejeremyman9
Major General
thejeremyman9's Avatar
4343
Rep
7,555
Posts

Drives: 2015 BMW 335i
Join Date: May 2019
Location: Cali

iTrader: (0)

Quote:
Originally Posted by Logicoeur View Post
I did one pull to 6 from 3 for the log above, but that was it. I've never revved the car up that much anyhow 😅. With MHD I may also be getting an extra conservative fuel map in open loop. I believe that mhd is a lot more deliberate with their failsafes than some other tuners, just from reading around here.
Yeah i saw you were only at like 30% throttle in that pull. And i agree based on everything i have seen, MHD is very stock-like
Appreciate 0
      10-19-2021, 09:06 PM   #16
Logicoeur
Lieutenant Colonel
Logicoeur's Avatar
988
Rep
1,934
Posts

Drives: F30 335i xDrive
Join Date: Feb 2018
Location: Boston

iTrader: (0)

Update:

Car feels much stronger now. Not noticing the lag as much anymore with the new wideband o2 sensor. Will take another log and compare.
__________________
F30 335iX | Remus Axleback | Fabspeed Catted DP | VRSF Comp IC | 18X9 ET35 19lb MT1 | 255/40/18 ECS | Ohlins RT Millway Street | Millway Control Arm Bushings | Turner Endlinks | TMH 75mm 14x1.5 Studs | BMW MPerf LSD | XDelete | Pipercross Filter | MHD Stg2 93
Appreciate 1
n55david1288.00
      10-20-2021, 08:53 AM   #17
BMWILUVU
Lieutenant Colonel
809
Rep
1,597
Posts

Drives: 340ix
Join Date: Mar 2017
Location: The Boibs

iTrader: (0)

Quote:
Originally Posted by Logicoeur View Post
Update:

Car feels much stronger now. Not noticing the lag as much anymore with the new wideband o2 sensor. Will take another log and compare.
Curious as to how many years your wideband O2 sensor lasted?
Appreciate 0
      10-20-2021, 08:56 AM   #18
Logicoeur
Lieutenant Colonel
Logicoeur's Avatar
988
Rep
1,934
Posts

Drives: F30 335i xDrive
Join Date: Feb 2018
Location: Boston

iTrader: (0)

Quote:
Originally Posted by BMWILUVU View Post
Quote:
Originally Posted by Logicoeur View Post
Update:

Car feels much stronger now. Not noticing the lag as much anymore with the new wideband o2 sensor. Will take another log and compare.
Curious as to how many years your wideband O2 sensor lasted?
Assuming from the factory. No idea if the prev owner ever changed it. 2013 build date, 86K mi. It happened after downpipe install so likely was moving it around that severed a wire somewhere we can't see.
__________________
F30 335iX | Remus Axleback | Fabspeed Catted DP | VRSF Comp IC | 18X9 ET35 19lb MT1 | 255/40/18 ECS | Ohlins RT Millway Street | Millway Control Arm Bushings | Turner Endlinks | TMH 75mm 14x1.5 Studs | BMW MPerf LSD | XDelete | Pipercross Filter | MHD Stg2 93
Appreciate 1
BMWILUVU809.00
      10-21-2021, 10:29 AM   #19
Logicoeur
Lieutenant Colonel
Logicoeur's Avatar
988
Rep
1,934
Posts

Drives: F30 335i xDrive
Join Date: Feb 2018
Location: Boston

iTrader: (0)

High way on ramp from a light. 1-2-3-4-3-4-5.

The 4-3 is after the on-ramp apex. https://datazap.me/u/logicoeur/1021-...-9-10-16-19-20
Seems and feels a lot better than before. The afr definitely move much higher when I'm on the throttle hard. I guess that is expected. Didn't know the readings would get so high like that though.
__________________
F30 335iX | Remus Axleback | Fabspeed Catted DP | VRSF Comp IC | 18X9 ET35 19lb MT1 | 255/40/18 ECS | Ohlins RT Millway Street | Millway Control Arm Bushings | Turner Endlinks | TMH 75mm 14x1.5 Studs | BMW MPerf LSD | XDelete | Pipercross Filter | MHD Stg2 93
Appreciate 0
      10-21-2021, 10:42 AM   #20
thejeremyman9
Major General
thejeremyman9's Avatar
4343
Rep
7,555
Posts

Drives: 2015 BMW 335i
Join Date: May 2019
Location: Cali

iTrader: (0)

Quote:
Originally Posted by Logicoeur View Post
High way on ramp from a light. 1-2-3-4-3-4-5.

The 4-3 is after the on-ramp apex. https://datazap.me/u/logicoeur/1021-...-9-10-16-19-20
Seems and feels a lot better than before. The afr definitely move much higher when I'm on the throttle hard. I guess that is expected. Didn't know the readings would get so high like that though.
I didnt really see above like 30% throttle and 5psi in the log, did you log WOT?

Anyways, the good news is LTFTs and STFTs seem to be moving as they should now, and AFR is tracking target. It's easier to see the AFR tracking if you trim the very end of the log off where the AFRs spike super high off throttle.
Appreciate 1
Logicoeur988.00
      10-21-2021, 10:44 AM   #21
Logicoeur
Lieutenant Colonel
Logicoeur's Avatar
988
Rep
1,934
Posts

Drives: F30 335i xDrive
Join Date: Feb 2018
Location: Boston

iTrader: (0)

Quote:
Originally Posted by thejeremyman9 View Post
Quote:
Originally Posted by Logicoeur View Post
High way on ramp from a light. 1-2-3-4-3-4-5.

The 4-3 is after the on-ramp apex. https://datazap.me/u/logicoeur/1021-...-9-10-16-19-20
Seems and feels a lot better than before. The afr definitely move much higher when I'm on the throttle hard. I guess that is expected. Didn't know the readings would get so high like that though.
I didnt really see above like 30% throttle and 5psi in the log, did you log WOT?

Anyways, the good news is LTFTs and STFTs seem to be moving as they should now, and AFR is tracking target. It's easier to see the AFR tracking if you trim the very end of the log off where the AFRs spike super high off throttle.
No idk if I was WOT. I'll have to make a note to mash it next time. The car pulls pretty hard I thought I was almost to the floor 🤣
__________________
F30 335iX | Remus Axleback | Fabspeed Catted DP | VRSF Comp IC | 18X9 ET35 19lb MT1 | 255/40/18 ECS | Ohlins RT Millway Street | Millway Control Arm Bushings | Turner Endlinks | TMH 75mm 14x1.5 Studs | BMW MPerf LSD | XDelete | Pipercross Filter | MHD Stg2 93
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 06:31 AM.




f30post
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