Lambda Sensor Problem?

   #1  

nah1024

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Hi

My first post, so sorry if I have stupid questions!

I have an Audi 8P 3.2 Quattro DSG. The problem I have is that it idles roughly sometimes. The autoscan does not throw up any faults (other than radio/nav/phone as I removed the built in radio). Having run through the measuring blocks to test various things the only things I can find are:

- 030. The pre-cat sensors alternate between various states, but the Heating "bit" never comes on, i.e. I get 00011 or 01011 or 00010 or 01010 but the third ("Lambda Sensor Heating On") bit never goes to one, which the label file tells me means there is no heating active. This is the same for both Bank 1 and Bank 2.
- 034/035. The Lambda aging tests for B1S1 and B1S2 do not complete. I can get them to start via Basic Settings, but it stays as Test On for up to 15 mins and never changes. The Cat temp goes up to 600C and the Delta Factor is about 0.6 generally. In short I never get to the state of OK or NOT OK.
- 033. The Lambda control for B1S1 and B2S1 are going outside the suggested ranges on occasion. Instead of always being between -10 and 10, they are between -13 and 12.
- EDIT - Also notice that Post Cat Voltages are also cycling between 0.1V and 0.7V. Shouldnt they be stable as they are Sensor 2?

I have tested the following and all ok: 208/209 Timing Chain (0-2 KW), MAF (gets to 80% HP), No misfires (015), Idle Stabilisation (055), Timing Retardation ok (020), has new spark plugs, running Shell V-Power Nitro at 99 RON.

Is any of this relevant or likely to impact the idling? Strange as Readiness has passed and no DTC faults.

---
Code:
Here is the top of the Autoscan as couldnt attach it:

Saturday,10,October,2015,16:50:01:28467
VCDS -- Windows Based VAG/VAS Emulator Running on Windows Vista x86
VCDS Version: 15.7.1.0
Data version: 20150904
www.Ross-Tech.com


VIN: WAUZZZ8P75A031568   License Plate: OV55 XKX
Mileage: 67360km-41855mi   Repair Order: 


Chassis Type: 8P (1K0)
Scan: 01 02 03 08 09 15 16 17 19 22 25 37 42 44 46 52 55 56 62 72
          77

VIN: WAUZZZ8P75A031568   Mileage: 67360km-41855miles

00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: Malfunction 0010 (Because no radio)
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: Malfunction 0010 (Because no radio)
22-AWD -- Status: Malfunction 0010 (Below it says no fault codes...)
25-Immobilizer -- Status: OK 0000
37-Navigation -- Status: Cannot be reached 1100 (Because no radio)
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: Cannot be reached 1100 (Because no radio)
62-Door, Rear Left -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
77-Telephone -- Status: Malfunction 0010 (Because no radio)
 
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   #2  

Jack@European_Parts

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Please post the full scan........

Is the car modified?

What is the status of TV being clean and properly adapted?
 
   #3  

smokey08

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Once you have checked the throttle body, check the fuels trims. Is there any unusual noise from the timing chain?
 
   #4  

nah1024

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Thank you Jack and Smokey for replying, sorry I have been busy the last few days.

Is the car modified? No, in fact just had new ECU software added by Audi (which made no difference)
Throttle Body Alignment has been done. Did seem to make a difference to throttle response but not idling. I haven't cleaned it.
Fuel trims [032?] are below, which look ok to me:
-0.8 % Adaptation (Idle) Bank 1 Sensor 1
-1.6 % Adaptation (Partial) Bank 1 Sensor 1
-0.4 % Adaptation (Idle) Bank 2 Sensor 1
-2.3 % Adaptation (Partial) Bank 2 Sensor 1
I cant here any unusual noise from the timing chain - drives fine when moving quickly!


I have copied the full AutoScan as requested:

Code:
Thursday,15,October,2015,09:45:58:28467
VCDS -- Windows Based VAG/VAS Emulator Running on Windows Vista x86
VCDS Version: 15.7.1.0
Data version: 20150904
www.Ross-Tech.com


VIN: WAUZZZ8P75A031568   License Plate: OV55XKX
Mileage: 67780km-42116mi   Repair Order: 


Chassis Type: 8P (1K0)
Scan: 01 02 03 08 09 15 16 17 19 22 25 37 42 44 46 52 55 56 62 72
77

VIN: WAUZZZ8P75A031568   Mileage: 67780km-42116miles

00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: Malfunction 0010
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: Malfunction 0010
22-AWD -- Status: Malfunction 0010
25-Immobilizer -- Status: OK 0000
37-Navigation -- Status: Cannot be reached 1100
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: Cannot be reached 1100
62-Door, Rear Left -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
77-Telephone -- Status: Malfunction 0010
 
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 022-906-032-BDB.lbl
   Part No SW: 022 906 032 CB    HW: Bas isX 3
   Component: MOTRONIC ME7.1.1    8088  
   Revision: 00000000    Serial number: AUX7Z0D6FNR0GD
   Coding: 0000178
   Shop #: WSC 57316 001 1048576
   VCID: 4DBF9F98D4BE2D56E6-8018

No fault code found.
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 02E-927-770.lbl
   Part No SW: 02E 300 046 D    HW: 02E 927 770 AD
   Component: GSG DSG             0606  
   Revision: 03149888    Serial number: 00000406290380
   Coding: 0000020
   Shop #: WSC 06435 000 00000
   VCID: 18113ECC2BFC98FE85-804C

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 1K0-907-379-MK60-A.lbl
   Part No: 1K0 907 379 E
   Component: ESP ALLRAD MK60     0103  
   Coding: 0021128
   Shop #: WSC 06435 000 00000
   VCID: 3449EA7C57545C9E89-8060

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 8P0-820-043.lbl
   Part No SW: 8P0 820 043 G    HW: 8P0 820 043 G
   Component: KlimavollautomatH12 0150  
   Revision: 004600      Serial number: 8P0820043G    
   Shop #: WSC 00000 000 00000
   VCID: 3041E66CA34C60BEED-8064

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels: 8P0-907-279-23-H.lbl
   Part No SW: 8P0 907 279 C    HW: 8P0 907 279 C
   Component: Bordnetz-SG     H31 0202  
   Revision: 00H31000    Serial number: 00000000946488
   Coding: E18E5F13B014100000160000160000000000FE0F5C
   Shop #: WSC 00000 000 00000
   VCID: 3D5FCF58641E9DD676-8068

   Subsystem 1 - Part No: 8P2 955 119 B  Labels: 1KX-955-119.CLB
   Component: Wischer AU350   H01 0130  
   Coding: 00062736
   Shop #: WSC 00000  

   Subsystem 2 - Part No: 4E0 910 557   Labels: 8K0-955-559.CLB
   Component: REGENLICHTSENSORH10 0040  
   Coding: 00150573
   Shop #: WSC 00000  

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 8P0-959-655-94.lbl
   Part No SW: 8P0 959 655 C    HW: 8P0 959 655 C
   Component:    Airbag 9.41  H10 2620  
   Revision: 91H10262    Serial number: 003620003G5Z  
   Coding: 0434622
   Shop #: WSC 06435 000 00000
   VCID: 42A5BCA41DE0E22E0B-8016

   Subsystem 1 - Serial number: 6332DRB400714A17D

   Subsystem 2 - Serial number: 6342DRB40072872AK

   Subsystem 3 - Serial number: 63528RB4001B25289

   Subsystem 4 - Serial number: 63628RB4001B28B9N

   Subsystem 5 - Serial number: 63729RB4001CFAC7/

   Subsystem 6 - Serial number: 63829RB4001CF7F5$

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 8P0-953-549.lbl
   Part No SW: 8P0 953 549 A    HW: 8P0 953 549 A
   Component: Lenks‰ulenmodul H10 0010  
   Coding: 0014112
   Shop #: WSC 06435 000 00000
   VCID: 3C59C25C7F0494DE41-8068

   Subsystem 1 - Part No: XXXXXXXXXXX 
   Component: Lenkradmodul    H04 0080

1 Fault Found:
01304 - Radio 
            004 - No Signal/Communication

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8P0-920-xxx-17-MY7.lbl
   Part No SW: 8P0 920 980 Q    HW: 8P0 920 980 Q
   Component: KOMBIINSTR. VDO H71 0210  
   Revision: D02         Serial number: 2246DD02000996
   Coding: 0001448
   Shop #: WSC 57316 001 1048576
   VCID: 45AFA7B80CCED5162E-8010

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels: 1K0-907-530-V1.clb
   Part No SW: 1K0 907 530 D    HW: 1K0 907 951 
   Component: Gateway         H08 0100  
   Revision: 08          Serial number: 2500104710040D
   Coding: FF3F03C8072103
   Shop #: WSC 06435 000 00000
   VCID: 28710E0C9B9C287E35-807C

2 Faults Found:
01300 - Control Module for Navigation with CD-Rom (J401) 
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 2
                    Fault Frequency: 254
                    Reset counter: 44
                    Mileage: 66768 km
                    Time Indication: 0
                    Date: 2015.09.28
                    Time: 15:27:23

01304 - Radio 
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 2
                    Fault Frequency: 254
                    Reset counter: 44
                    Mileage: 66768 km
                    Time Indication: 0
                    Date: 2015.09.28
                    Time: 15:27:23


-------------------------------------------------------------------------------
Address 22: AWD        Labels: 1K0-907-554.lbl
   Part No: 1K0 907 554 
   Component: HALDEX 4Motion      0101  
   Coding: 0000001
   Shop #: WSC 00000 000 00000
   VCID: 6AF534044510DA6EE3-803E

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer        Labels: 1K0-920-xxx-25.clb
   Part No SW: 8P0 920 980 Q    HW: 8P0 920 980 Q
   Component: KOMBIINSTR. VDO H71 0210  
   Revision: D02         Serial number: AUX7Z0D6FNR0GD
   Shop #: WSC 00000 000 00000
   VCID: 45AFA7B80CCED5162E-8010

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation
Cannot be reached

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver        Labels: 8P0-959-801-MIN1.lbl
   Part No: 8P0 959 801 E
   Component: Tuersteuerger.  H10 0030  
   Coding: 0000048
   Shop #: WSC 06435 000 00000
   VCID: 3D5FCF58641E9DD676-8068

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist        Labels: 1Kx-909-14x-44.clb
   Part No: 1K2 909 144 G
   Component: EPS_ZFLS Kl.10      1301  
   Shop #: WSC 00000 000 00000
   VCID: 3041E66CA34C60BEED-8064

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels: 8P0-959-433.lbl
   Part No: 8P0 959 433 C
   Component:    KSG          H03 0050  
   Coding: 188000186D088505489FC63000
   Shop #: WSC 00062 210 83771
   VCID: 3C59C25C7F0494DE41-8068

   Subsystem 1 - Part No: 1K0 951 605 A
   Component: LIN BACKUP HORN H01 1201

   Subsystem 2 - Part No: 1K0 907 719 
   Component: Neigungssensor  003 0003

   Subsystem 3 - Part No: 8P0 951 177 
   Component: Innenraumueberw.H03 0010

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass.        Labels: 8P0-959-802-MIN1.lbl
   Part No: 8P0 959 802 E
   Component: Tuersteuerger.  H10 0030  
   Coding: 0000048
   Shop #: WSC 06435 000 00000
   VCID: 3E5DC854691886CE6F-806A

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 8P0-907-357.lbl
   Part No: 8P0 907 357 A
   Component: Dynamische LWR  H01 0010  
   Revision: 00000000    Serial number:               
   Coding: 0000002
   Shop #: WSC 06435 000 00000
   VCID: 3851DE4C4B3CB8FEA5-806C

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio
Cannot be reached

-------------------------------------------------------------------------------
Address 62: Door, Rear Left        Labels: 8P4-959-801.lbl
   Part No: 8P4 959 801 B
   Component: Tuer-SG         H10 0010  
   Coding: 0000144
   Shop #: WSC 06435 000 00000
   VCID: 3E5DC854691886CE6F-806A

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right        Labels: 8P4-959-802.lbl
   Part No: 8P4 959 802 B
   Component: Tuer-SG         H10 0010  
   Coding: 0000144
   Shop #: WSC 06435 000 00000
   VCID: 3FA3B5506E128FC664-806A

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone        Labels: 8P0-862-335.lbl
   Part No SW: 8P0 862 335 D    HW: 8P0 862 335 D
   Component: FSE_255x BT     H18 0050  
   Revision: 00000001    Serial number: 00000000095794
   Coding: 0001422
   Shop #: WSC 06435 000 00000
   VCID: 3753DD704622B786AC-8062

1 Fault Found:
01304 - Radio 
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 28
                    Mileage: 66768 km
                    Time Indication: 0
                    Date: 2015.09.28
                    Time: 15:27:21


End-------------------------(Elapsed Time: 01:38)--------------------------
 
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   #6  

nah1024

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This strikes me as odd and has the hint smell of an FOD fart in the air.

How's the MAF.......and pre intake or air filter?

Oil level?

Hi Jack - Has a new Air Filter. I havent cleaned the MAF - do you think that is worth doing? Oil level is normal.
 
   #7  

nah1024

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Also, what I have noticed doing more tests is that the pre-cat Lambda sensors alternate between high and low voltage (1.4 and 1.6V as it says in the label file), but the post cat lambda sensors also vary between 0.1 and 0.8V. Is this correct? I thought the post cat sensors should be relatively stable voltage wise.

I did a long drive from cold and the heating for both Bank 1 and Bank 2 lambda sensors never is activated. Seems weird that they both would have failed...

Basically I dont know what they are supposed to do voltage wise or heating wise so I cant tell if this is an issue or not.

Sorry if this isnt much help...
 
   #8  

Jack@European_Parts

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www.erwin.audi.com

I think if you want to salted shotgun the repair process, a Genuine MAF is a good start, based on your complaint and history of others.

The ECU is suspect FOD.............
 
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