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Thread: O2 Sensor Fault Code

  1. #1
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    O2 Sensor Fault Code

    Hello

    I've an Allroad 2.7t -04 and I've fault code "P0131 - Oxygen (Lambda) Sensor B1 S1: Signal too Low". Is it a bad sensor? I've checked the resistance at the sensor connector and it's 10 ohms so that's fine. The wires from the ECU to the sensor seems fine.

    I logged this in VCDS. Don't know if that tells you something. Yes, this was last year but it's still the same:

    Code:
    Saturday,22,September,2018,17:02:37:02198
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x64
    VCDS Version: 18.2.1.5 (x64)  HEX-V2 CB: 0.4411.4
    Data version: 20180518 DS287.2
    www.Ross-Tech.com
    
    
    
    
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
                    Address 01: Engine  (4Z7 907 551 N)
    
    17:02:25 Group 031: Lambda Control
      0.010 V  Bank 1 Sensor 1 (actual)
      0.450 V  Bank 1 Sensor 1 (specified)
      0.680 V  Bank 2 Sensor 1 (actual)
      0.455 V  Bank 2 Sensor 1 (specified)
    
    17:02:25 Group 032: Lambda Control (Mixture Adaptation)
      9.9 %  Adaptation (Idle) Bank 1 Sensor 1
      -0.8 %  Adaptation (Partial) Bank 1 Sensor 1
      -0.8 %  Adaptation (Idle) Bank 2 Sensor 1
      -2.3 %  Adaptation (Partial) Bank 2 Sensor 1
    
    17:02:25 Group 033: Lambda Control
      25.0 %  Lambda Control Bank 1 Sensor 1
      0.010 V  Sensor Voltage Bank 1 Sensor 1
      -16.4 %  Lambda Control Bank 2 Sensor 1
      0.630 V  Sensor Voltage Bank 2 Sensor 1

  2. #2
    Ross-Tech Employee Jef's Avatar
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    Hey hey!

    Please include a full Auto-Scan when asking for help:
    https://forums.ross-tech.com/showthr...t-an-Auto-Scan


    Quote Originally Posted by classexa View Post
    17:02:25 Group 032: Lambda Control (Mixture Adaptation)
    9.9 % Adaptation (Idle) Bank 1 Sensor 1
    -0.8 % Adaptation (Partial) Bank 1 Sensor 1
    -0.8 % Adaptation (Idle) Bank 2 Sensor 1
    -2.3 % Adaptation (Partial) Bank 2 Sensor 1

    17:02:25 Group 033: Lambda Control
    25.0 % Lambda Control Bank 1 Sensor 1
    0.010 V Sensor Voltage Bank 1 Sensor 1
    -16.4 % Lambda Control Bank 2 Sensor 1
    0.630 V Sensor Voltage Bank 2 Sensor 1
    [/CODE]
    Looking very lean there. Check out our page on fuel trim:
    http://wiki.ross-tech.com/wiki/index.php/Fuel_Trim_Info

    Post the full Auto-Scan!
    Jef
    Ross Tech Support Team, Alpha Squad
    Auto-Scan, learn it, love it, live it... then check the fuses.

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  4. #3
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    Sorry about that. Here you go:

    Code:
    Saturday,12,January,2019,11:44:59:02198
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x64
    VCDS Version: 18.9.0.4 (x64)  HEX-V2 CB: 0.4437.4
    Data version: 20181017 DS296.0
    www.Ross-Tech.com
    
    
    VIN: WAUZZZ4B44N041931   License Plate: 
    
    
    Chassis Type: 4B (01 - Allroad)
    Scan: 01 02 03 08 15 17 25 34 35 55 56
     
    VIN: WAUZZZ4B44N041931   Mileage: 269080km-167198miles
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 078-907-551-AZA.lbl
       Part No: 4Z7 907 551 N
       Component: 2.7L V6/5VT     G   0003  
       Coding: 11755
       Shop #: WSC 01120  
       VCID: 4EC592D8E9C7AC175C7-5160
       WAUZZZ4B44N041931     AUZ7Z0C2464255
    
    1 Fault Found:
    16515 - Oxygen (Lambda) Sensor B1 S1 
                P0131 - 35-10 - Signal too Low - Intermittent
    Readiness: 0000 0000
    
    -------------------------------------------------------------------------------
    Address 02: Auto Trans        Labels: 01V-927-156.lbl
       Part No: 4Z7 927 156 L
       Component: AG5 01V 2.7l5VT RdW 2122  
       Coding: 00001
       Shop #: WSC 00000  
       VCID: 4FFB8FDCEECDA51F571-5184
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels: 8D0-907-389.lbl
       Part No: 4Z7 907 389 A
       Component: ABS/ESP allrad      D56  
       Coding: 06497
       Shop #: WSC 40967  
       VCID: 4ACD9EC815AF803700F-5184
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC        Labels: 4B0-820-043-MY2.lbl
       Part No: 4B0 820 043 AP
       Component: A6-Klimavollautomat 0208  
       Coding: 00000
       Shop #: WSC 00000  
       VCID: 688944406B53522736B-258E
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 4B0-959-655-AI84.lbl
       Part No: 4Z7 959 655 H
       Component: Airbag 8.4EP        3000  
       Coding: 0001706
       Shop #: WSC 02334 785 00200
       VCID: 54F180B0C2EBC6C76A3-5184
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments        Labels: 4B0-920-xxx-17.lbl
       Part No: 4B0 920 933 P
       Component: KOMBI+WEGFAHRS. VDO D14  
       Coding: 04164
       Shop #: WSC 01120  
       VCID: 3039EC209333DAE72EB-5160
       WAUZZZ4B44N041931     AUZ7Z0C2464255
    
    1 Fault Found:
    01304 - Radio 
                49-00 - No Communications
    
    -------------------------------------------------------------------------------
    Address 34: Level Control        Labels: 4Z7-907-553.lbl
       Part No: 4Z7 907 553 F
       Component:  - 2C1A1          X060    
       Coding: 25500
       Shop #: WSC 02334  
       VCID: 48C9A4C00BA3722716B-5160
    
    1 Fault Found:
    01772 - Signal from Level Control Pressure Sensor (G291) 
                27-10 - Implausible Signal - Intermittent
    
    -------------------------------------------------------------------------------
    Address 35: Centr. Locks        Labels:. 4B0-962-258.lbl
       Part No: 4B0 962 258 L
       Component: Zentralverriegelung D38  
       Coding: 06721
       Shop #: WSC 02334  
       VCID: 323DE6289D0FE8F758F-4F0C
    
    4 Faults Found:
    01561 - Rear left door 
                59-10 - Can't Unlock - Intermittent
    01562 - Rear right door 
                59-10 - Can't Unlock - Intermittent
    01561 - Rear left door 
                61-00 - Won't De-Safe
    01562 - Rear right door 
                61-10 - Won't De-Safe - Intermittent
    
    -------------------------------------------------------------------------------
    Address 55: Headlight Range        Labels: 4Z7-907-357.lbl
       Part No: 4Z7 907 357 
       Component: dynamische LWR       D09  
       Coding: 00030
       Shop #: WSC 02334  
       VCID: 045170F0773B9647BA3-4B5C
    
    No fault code found.
    
    End----------(Elapsed Time: 01:50, VBatt start/end: 13.8V/13.7V)-----------
    So reading that link you gave me and looking at the numbers, I might have a vakuum leak somewhere? But is that related to the fault code? I also have misfires on Cyl 4 but the plug and ignition coil are fine. I've swithced them around and checked. There's no code on this. I checked the measuring blocks in VCDS. It also appears that it's only noticable when idling, not when driving. Could these 2 things be related?
    Last edited by classexa; 01-18-2019 at 03:16 PM.

  5. #4
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    Quote Originally Posted by classexa View Post
    Sorry about that. Here you go:

    Code:
    Saturday,12,January,2019,11:44:59:02198
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x64
    VCDS Version: 18.9.0.4 (x64)  HEX-V2 CB: 0.4437.4
    Data version: 20181017 DS296.0
    www.Ross-Tech.com
    
    
    VIN: WAUZZZ4B44N041931   License Plate: 
    
    
    Chassis Type: 4B (01 - Allroad)
    Scan: 01 02 03 08 15 17 25 34 35 55 56
     
    VIN: WAUZZZ4B44N041931   Mileage: 269080km-167198miles
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 078-907-551-AZA.lbl
       Part No: 4Z7 907 551 N
       Component: 2.7L V6/5VT     G   0003  
       Coding: 11755
       Shop #: WSC 01120  
       VCID: 4EC592D8E9C7AC175C7-5160
       WAUZZZ4B44N041931     AUZ7Z0C2464255
    
    1 Fault Found:
    16515 - Oxygen (Lambda) Sensor B1 S1 
                P0131 - 35-10 - Signal too Low - Intermittent
    Readiness: 0000 0000
    
    -------------------------------------------------------------------------------
    Address 02: Auto Trans        Labels: 01V-927-156.lbl
       Part No: 4Z7 927 156 L
       Component: AG5 01V 2.7l5VT RdW 2122  
       Coding: 00001
       Shop #: WSC 00000  
       VCID: 4FFB8FDCEECDA51F571-5184
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels: 8D0-907-389.lbl
       Part No: 4Z7 907 389 A
       Component: ABS/ESP allrad      D56  
       Coding: 06497
       Shop #: WSC 40967  
       VCID: 4ACD9EC815AF803700F-5184
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC        Labels: 4B0-820-043-MY2.lbl
       Part No: 4B0 820 043 AP
       Component: A6-Klimavollautomat 0208  
       Coding: 00000
       Shop #: WSC 00000  
       VCID: 688944406B53522736B-258E
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 4B0-959-655-AI84.lbl
       Part No: 4Z7 959 655 H
       Component: Airbag 8.4EP        3000  
       Coding: 0001706
       Shop #: WSC 02334 785 00200
       VCID: 54F180B0C2EBC6C76A3-5184
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments        Labels: 4B0-920-xxx-17.lbl
       Part No: 4B0 920 933 P
       Component: KOMBI+WEGFAHRS. VDO D14  
       Coding: 04164
       Shop #: WSC 01120  
       VCID: 3039EC209333DAE72EB-5160
       WAUZZZ4B44N041931     AUZ7Z0C2464255
    
    1 Fault Found:
    01304 - Radio 
                49-00 - No Communications
    
    -------------------------------------------------------------------------------
    Address 34: Level Control        Labels: 4Z7-907-553.lbl
       Part No: 4Z7 907 553 F
       Component:  - 2C1A1          X060    
       Coding: 25500
       Shop #: WSC 02334  
       VCID: 48C9A4C00BA3722716B-5160
    
    1 Fault Found:
    01772 - Signal from Level Control Pressure Sensor (G291) 
                27-10 - Implausible Signal - Intermittent
    
    -------------------------------------------------------------------------------
    Address 35: Centr. Locks        Labels:. 4B0-962-258.lbl
       Part No: 4B0 962 258 L
       Component: Zentralverriegelung D38  
       Coding: 06721
       Shop #: WSC 02334  
       VCID: 323DE6289D0FE8F758F-4F0C
    
    4 Faults Found:
    01561 - Rear left door 
                59-10 - Can't Unlock - Intermittent
    01562 - Rear right door 
                59-10 - Can't Unlock - Intermittent
    01561 - Rear left door 
                61-00 - Won't De-Safe
    01562 - Rear right door 
                61-10 - Won't De-Safe - Intermittent
    
    -------------------------------------------------------------------------------
    Address 55: Headlight Range        Labels: 4Z7-907-357.lbl
       Part No: 4Z7 907 357 
       Component: dynamische LWR       D09  
       Coding: 00030
       Shop #: WSC 02334  
       VCID: 045170F0773B9647BA3-4B5C
    
    No fault code found.
    
    End----------(Elapsed Time: 01:50, VBatt start/end: 13.8V/13.7V)-----------
    So reading that link you gave me and looking at the numbers, I might have a vakuum leak somewhere? But is that related to the fault code? I also have misfires on Cyl 4 but the plug and ignition coil are fine. I've swithced them around and checked. There's no code on this. I checked the measuring blocks in VCDS. It also appears that it's only noticable when idling, not when driving. Could these 2 things be related?
    At idle usually indicative of smaller intake leak as under larger throttle opening small leak is insignificant at speeds.

    Could swap sensors as a test if they are the same but would spray intake in all areas while at idle and see if numbers change on bank 1. What to use there are various opinions such as WD40.



    LARIMORE

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  7. #5
    NostraJackAss Jack@European_Parts's Avatar
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    The miss is either from a small isolated multiplicative vacuum leak, carbon build up, weak cylinder ( check compression ), burned valve, bad injector spray pattern at idle ( most likely ), bad ground to coil pack or trigger or B+ connectivity issue.

    OXS sensor might just be plain contaminated with carbon deposits or bad.
    European Parts Emporium/Performance / Immobilizer Solutions EPE
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  9. #6
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    Thanks for all the answers. Looks like there could be many things. I'll start by doing a compression test tomorrow and go from there

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