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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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