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      06-12-2013, 07:42 AM   #1
happos2
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Exclamation O2 Sensor Fault Codes - Deciphering Help

MY 03/08 E92 M with pullies / test pipes / air filter / Stage II tune.

I had issues with my Throttle Valve Actuators and got them replaced under warranty (though had to pay a deductible). Now I have some O2 sensor faults (known to be problematic sometimes) so I just want some help deciphering which ones I need to replace. Here are the codes:

27C7 - Lambda sensor trim control AD diagnostic bank 2
2771 - Lambda sensor dynamic diagnostic VKAT bank 1

From my understanding:
VKAT = VOR (before) Cat
NKAT = NACH (after) Cat
bank 2 = drivers side
bank 1 = passenger side

So it looks like I should replace both before Cat 02 Sensors. Just want some concurence prior to buying the following 02 sensors:

http://www.amazon.com/Bosch-17039-Ox.../dp/B000JZEXG8

Thanks for the reassurance!
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      06-12-2013, 03:38 PM   #2
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2771 - P0133
Information saved in: DME
Fault code: 2771 - P0133
Fault text: Oxygen sensor dynamic diagnosis before catalytic
converter, bank 1
Fault description: O2 Sensor Circuit Slow Response (Bank 1 Sensor
1)

Condition for fault identification
Test condition: Amplitude of oxygen sensor less than diag. value
0.35 (K_LAVK_OBD_DYN_WERT_MAX)
Terminal condition: Engine running - Condition idle or partload
Voltage condition: none

Condition for fault memory entry: none

Action in service:
1. Clear fault memory, oxygen sensor system test
2. Check exhaust system for leaks
3. Replace pre-cat oxygen sensor LSVK B1

Fault effect and breakdown warning: MIL on after engine runs 2x /
possible mild effect on drivability...surge during steady-state
operation

Driver information Warning light: MIL

Service instruction: none

=====

27C7 - P2099
Information saved in: DME
Fault code: 27C7 - P2099
Fault text: Oxygen sensor, adaptation, trim control, bank 2
Fault description: Post Catalyst Fuel Trim System Too Rich (Bank
2)

Condition for fault identification
Test condition: Adaptation value reaches max. limit and hangs in
this position
Terminal condition: Engine running
Voltage condition: none

Condition for fault memory entry: Counter for recognition at
adaptation limit >= (2x) K_LA_TRIM_DIAG_I_AD_MAX_SCHW

Action in service:
1. Check the fuel system and the exhaust system for leaks
2. Check pre-cat and post-cat sensors and replace as indicated

Fault effect and breakdown warning: MIL on after engine runs 2x

Driver information Warning light: MIL

Service instruction: none
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      06-12-2013, 04:39 PM   #3
happos2
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Quote:
Originally Posted by Sam@Alekshop View Post
......
Thanks for the information!

Well I will double check the clamps for my test pipes as well as bolts to the header.

If the problem persists, then I should replace both Pre-O2 sensors..maybe post cat on drivers side if the problem persists even more....

Positive reassurance please!

Last edited by happos2; 06-13-2013 at 06:12 AM..
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      06-13-2013, 06:12 AM   #4
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Sound right?
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      06-14-2013, 06:58 AM   #5
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Morning bump.
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      06-14-2013, 07:52 AM   #6
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Quote:
Originally Posted by happos2 View Post
Morning bump.
Sorry my friend,very busy at work.
Lets see, i would start by clearing the code and do a drive cycle and see what happens.
Your car is an 08 so i would also suggest a fresh set of primary O2s if the codes come back.

Also,which tune do you have ? Did all these codes started popping up after the new tune was loaded ?

Good Luck and send me a PM if you need help with anything.
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      06-14-2013, 11:23 AM   #7
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Quote:
Originally Posted by Sam@Alekshop View Post
Sorry my friend,very busy at work.
Lets see, i would start by clearing the code and do a drive cycle and see what happens.
Your car is an 08 so i would also suggest a fresh set of primary O2s if the codes come back.

Also,which tune do you have ? Did all these codes started popping up after the new tune was loaded ?

Good Luck and send me a PM if you need help with anything.
No worries what so ever, you were nice enough to post the very helpful information! Andy busy means keep making money!!

I have cleared them once already and then the came back in a few hundred miles.

I have had these codes pop up whenever the throttle valve actuator whould act up. therefore I thought it was part of the Throttle valve actuator. this happened all before any tuning was done on my car.
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      06-15-2013, 02:23 AM   #8
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Quote:
Originally Posted by happos2 View Post
No worries what so ever, you were nice enough to post the very helpful information! Andy busy means keep making money!!

I have cleared them once already and then the came back in a few hundred miles.

I have had these codes pop up whenever the throttle valve actuator would act up. therefore I thought it was part of the Throttle valve actuator. this happened all before any tuning was done on my car.
Get it replaced,its a very simple and straight forward job.All depends how handy are you with tools


Follow this and PM me with any questions plz:
http://www.m3post.com/forums/showthread.php?t=735033

I would personally change the O2s first cause throttle actuators are pricey
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      07-02-2013, 06:47 AM   #9
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Quote:
Originally Posted by Sam@Alekshop View Post
Get it replaced,its a very simple and straight forward job.All depends how handy are you with tools


Follow this and PM me with any questions plz:
http://www.m3post.com/forums/showthread.php?t=735033

I would personally change the O2s first cause throttle actuators are pricey
Well, here is an update. I replaced the O2 sensors. Drove about 50 miles and the 27C7 O2 Bank 2 code came back. I replaced both sensors while I was under the car.

I also checked to make sure my clamps for the test pipes were tight and they were.

Now I am not sure what the next step would be. Any suggestions?
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      07-02-2013, 01:05 PM   #10
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bump
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      07-02-2013, 01:34 PM   #11
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Did you replace the post cat oxygen sensors or the precat sensors?
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      07-02-2013, 02:21 PM   #12
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Quote:
Originally Posted by Mike Benvo View Post
Did you replace the post cat oxygen sensors or the precat sensors?
Pre-Cats. Guess I should replace post cat.

This one to be exact:

http://www.amazon.com/Bosch-16793-Ox...1&s=automotive

Last edited by happos2; 07-02-2013 at 02:57 PM..
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      07-02-2013, 10:24 PM   #13
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Quote:
Originally Posted by happos2 View Post
Pre-Cats. Guess I should replace post cat.

This one to be exact:

http://www.amazon.com/Bosch-16793-Ox...1&s=automotive
Probably a good idea to replace both.
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      11-18-2015, 07:30 PM   #14
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Quote:
Originally Posted by happos2
Quote:
Originally Posted by Mike Benvo View Post
Did you replace the post cat oxygen sensors or the precat sensors?
Pre-Cats. Guess I should replace post cat.

This one to be exact:

http://www.amazon.com/Bosch-16793-Ox...1&s=automotive
So what happened? I'm sort of in the same issue as you with the 27C7, and 2727 codes from bank 2. Not sure what to do.
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      12-11-2015, 04:22 PM   #15
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Quote:
Originally Posted by M3LISSA View Post
So what happened? I'm sort of in the same issue as you with the 27C7, and 2727 codes from bank 2. Not sure what to do.
This was some time ago...I really don't remember. I only remember replacing my pre-cat sensors (post cats don't really mater after you tune and get test pipes). If you don't have test pipes, then replace your post cat sensors.
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      12-13-2015, 10:59 PM   #16
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Quote:
Originally Posted by happos2
Quote:
Originally Posted by M3LISSA View Post
So what happened? I'm sort of in the same issue as you with the 27C7, and 2727 codes from bank 2. Not sure what to do.
This was some time ago...I really don't remember. I only remember replacing my pre-cat sensors (post cats don't really mater after you tune and get test pipes). If you don't have test pipes, then replace your post cat sensors.
Well I have test pipes and my code was for pre and post on drivers side. I replaced them both and cleared the codes and I'm fine.
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      04-18-2019, 10:54 AM   #17
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Guys, I have acrapovic exhaust and last OEM DME software without any tune.

For a long time I had only two DME error codes:

2789 - Catalytic-converter conversion, bank 1
278A - Catalytic-converter conversion, bank 2

So it is normal because acra does not have the cats.

Sometime ago I got more error codes:
2727 - Oxygen sensor before cat., bank 2, plausibility
277D - Oxygen sensor trim control diagnosis, bank 2
27C7 - Oxygen sensor, adaptation, trim control, bank 2

So, I desided to replace my pre-cat O2 sensor driver side. Yesterday I replaced it. Today I deleted all error codes and drove my car. Gets approx 100 km and I see the MIL (small check engine light) on my dashboard. I read my error codes again and I see the next errors:

277D - Oxygen sensor trim control diagnosis, bank 2
27C7 - Oxygen sensor, adaptation, trim control, bank 2

What's wrong? Maybe the reason is something other than my bank 2 O2 sensor?
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      04-24-2019, 06:40 AM   #18
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nobody knows?
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      05-23-2020, 08:58 AM   #19
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Hello Roman.

Did you find the problem?
I have the same codes.
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