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Thread: How to do G450 adaptation correctly

  1. #1
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    How to do G450 adaptation correctly

    OK, so I've had a few issues with my A4 B7 Cabriolet smoking badly (sometimes blue, sometimes black, sometimes never).
    When I bought it about a month ago, VCDS said that there was a fault with the G450 sensor, and I kept getting P2002 and the car would go into limp mode.

    Anyway, I replaced the G450 sensor, but the original sensor that was on it was literally just 'hooked' onto the bolt in the engine bay, and the thicker of the two hoses, looked to have frayed a bit inside.
    I imagine that the sensor had been replaced at some point, and that a small slit was put in the end of the hsoe when prying it off with a small screwdriver, so the end of the hose was cut with a blunt knife. That's my best guess.

    So I replaced the sensor, done the CANBUS method for adaptation on VCDS, and went on my way. All was good for about a day, then smoking again and same issues. Other than the smoke and the error, the can ran pretty well, before replacing the sensor as well as afterwards.

    I then removed and cleaned out the EGR valve and when I started the car first time, it shuddered and blew lots of black smoke, then instantly went to running as it had been previously.

    Fast forward to a few days ago. I go on partslink24.com and pay for a 24 hour access period, and discover that the G450 sensor which I had installed, and which was on the car when I got it, are not the correct part.

    Original sensor was BOSCH 0 281 002 710.
    Sensor I changed to was BOSCH 0 281 006 005.
    After looking at PL24, I changed it to 076906051A

    Now, there is no smoke from the car. Brilliant!

    However, I know get the P2002 code come back every so often and the Engine Light comes on.

    At first, a pro tuner diagnosed the engine over the phone and said no DPF was installed, only a CAT, but surely the G450 shows that a DPF is installed - the two hoses on the G450 go to the DPF, right?

    So now, my question is this.
    When I installed the new sensor, I followed this procedure:
    I turn on ignition and use VCDS to goto "Coding II" in "01 - Engine"
    Enter the 306xx something or other code that appears for G450 adaptation and click 'Do It!'.
    I get a message saying 'Coding accepted' or words to that affect.
    Switch ignition off and remove keys.
    Wait for 1 minute
    Turn ignition on, then start engine.

    That should be everything done, right?

    The Wiki pages say that "After the key is cycled back on the adaptation should be completed. If it is not completed, proceed with the next steps"

    How do I check that the adaptation has worked correctly?

    I've been told to check the MVB for Soot Load or Ash Level, but cannot find any reference to that anywhere.

    Should I need to force a regen on VCDS now and go for a drive whilst monitoring VCDS for the regen status?

    Here is the latest autoscan from VCDS which I done tonight just after the Check Engine light came on.

    Code:
    Friday,26,June,2020,23:43:45:43836
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: 20.4.1.0 (x64)  HEX-V2 CB: 0.4508.4
    Data version: 20200331 DS317.0
    www.Ross-Tech.com
    
    VIN: WAUZZZ8H88K013250   License Plate: FE08
    Mileage: 142560km-88582mi   Repair Order:
     
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    Chassis Type: 8H (8H - Audi Cabrio B6/B7 (2003 > 2009))
    Scan: 01 02 03 08 09 0F 11 15 16 17 18 25 26 36 37 45 46 55 56 57
              63 65 67 73 75 76 77
     
    VIN: WAUZZZ8H88K013250   Mileage: 142560km-88582miles
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 03G-906-016-BPW.clb
       Part No SW: 03G 906 016 LQ    HW: 03G 906 016 KP
       Component: R4 2,0L EDC  000CG  1717 
       Revision: --H06---    Serial number:              
       Coding: 0000076
       Shop #: WSC 66565 257 00032
       VCID: 7DA7FCDBC1FBDD2338D-8028
    2 Faults Found:
    008194 - Particulate Trap Bank 1
                   P2002 - 000 - Efficiency Below Threshold
                 Freeze Frame:
                        Fault Status: 01110000
                        Fault Priority: 2
                        Fault Frequency: 4
                        Reset counter: 255
                        Mileage: 142371 km
                        Time Indication: 0
                 Freeze Frame:
                        RPM: 1512 /min
                        Speed: 71.0 km/h
                        (no units): 0.00
                        (no units): -15.30
                        Mass Flow: 19.91 g/s
                        Temperature: 324.0°C
                        Temperature: 29.7°C
    005697 - Please check DTC Memory of A/C Controller
                   P1641 - 000 -  - Intermittent
                 Freeze Frame:
                        Fault Status: 00100000
                        Fault Priority: 6
                        Fault Frequency: 40
                        Reset counter: 255
                        Mileage: 142395 km
                        Time Indication: 0
                 Freeze Frame:
                        RPM: 840 /min
                        Speed: 0.0 km/h
                        Load: 0.0 %
                        Voltage: 13.76 V
                        Bin. Bits: 00000000
                        Temperature: 71.1°C
                        (no units): 0.0
    Readiness: 1 1 0 0 0
    -------------------------------------------------------------------------------
    Address 02: Auto Trans        Labels: 01J-927-156.lbl
       Part No SW: 8E5 910 155 J    HW: 01J 927 156 HT
       Component: V30 01J 2.0l PD RdW 0040 
       Revision: 00000012    Serial number: 00000002103869
       Coding: 0000001
       Shop #: WSC 04940 001 00001
       VCID: 313F10EB4D23E943EC5-8064
    No fault code found.
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels: 8E0-910-517.clb
       Part No SW: 8E0 910 517 H    HW: 8E0 614 517 BF
       Component: ESP8 FRONT      H06 0140 
       Revision: 00000000    Serial number: 00000000000000
       Coding: 0004402
       Shop #: WSC 63252 001 1048576
       VCID: 2C01019F6A0184ABDF3-8078
    No fault code found.
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC        Labels: 8E0-820-043.lbl
       Part No: 8E0 820 043 BL
       Component:   A4 Klimaautomat   3233 
       Coding: 00100
       Shop #: WSC 00672 
       VCID: 6C81C19FAF9144AB9F3-50F4
    No fault code found.
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect.        Labels: 8E0-907-279-8EC.lbl
       Part No: 8E0 907 279 N
       Component: int. Lastmodul  ECE 0907 
       Coding: 20001
       Shop #: WSC 00672 
       VCID: 3D273CDB846B1D2378D-4AA4
    No fault code found.
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 8H0-959-655-94.lbl
       Part No SW: 8H0 959 655 G    HW: 8H0 959 655 G
       Component:    Airbag 9.42  H01 1840 
       Revision: 92H01184    Serial number: 003CZ0008MD7 
       Coding: 0071114
       Shop #: WSC 63252 001 1048576
       VCID: 3E253BD78C7D063B617-806A
       Subsystem 1 - Serial number: 6332BRB403876EFB2
       Subsystem 2 - Serial number: 6342BRB4038D8403L
       Subsystem 3 - Serial number: 63729RB4037B0B95T
       Subsystem 4 - Serial number: 63829RB4037B015EP
    No fault code found.
    -------------------------------------------------------------------------------
    Address 16: Steering wheel        Labels: 8E0-953-549.lbl
       Part No: 8E0 953 549 Q
       Component: Lenksáulenmodul     0801 
       Coding: 03111
       Shop #: WSC 00672 
       VCID: 41DF402BF89379C31C5-4AA4
    No fault code found.
    -------------------------------------------------------------------------------
    Address 17: Instruments        Labels: 8E0-920-9xx-8EC.lbl
       Part No SW: 8H0 920 951 D    HW: 8H0 920 951 D
       Component: KOMBI+WFS 4     H14 0200 
       Revision: 0200        Serial number: 00000000000000
       Coding: 0006411
       Shop #: WSC 56029 002 1048576
       VCID: 2E050B975C0DF6BBF17-50F4
    1 Fault Found:
    01302 - Control Module for Telematic (J499)
                004 - No Signal/Communication
    -------------------------------------------------------------------------------
    Address 25: Immobilizer        Labels: 8E0-920-9xx-8EC.lbl
       Part No SW: 8H0 920 951 D    HW: 8H0 920 951 D
       Component: KOMBI+WFS 4     H14 0200 
       Revision: 0200        Serial number: 00000000000000
       Coding: 0006411
       Shop #: WSC 56029 002 1048576
       VCID: 2E050B975C0DF6BBF17-50F4
    1 Fault Found:
    01302 - Control Module for Telematic (J499)
                004 - No Signal/Communication
    -------------------------------------------------------------------------------
    Address 26: Auto Roof        Labels: 8H0-959-255.lbl
       Part No: 8H0 959 255 A
       Component:  VSG  B6 CABRIO     7094 
       Shop #: WSC 00672 785 00200
       VCID: 343119FFB221DC6B873-50F4
    2 Faults Found:
    02000 - Switch Position
                008 - Implausible Signal - Intermittent
    01992 - Convertible Top Compartment Latch Switch (F293); Unlock
                008 - Implausible Signal - Intermittent
    -------------------------------------------------------------------------------
    Address 45: Inter. Monitor        Labels: 8E0-951-177.lbl
       Part No: 8H0 951 178
       Component: Innenraumueberw.   0411 
       Coding: 00001
       Shop #: WSC 00000 
       VCID: 6FBBD6939E87BFB3BA1-50AE
    No fault code found.
    -------------------------------------------------------------------------------
    Address 46: Central Conv.        Labels:. 8E0-959-433-MAX.clb
       Part No: 8H0 959 433 M
       Component: Komfortgerát T3B    5442 
       Coding: 06911
       Shop #: WSC 00672 
       VCID: 3E253BD7896D063B617-4AA4
       Subsystem 1 - Part No: 8H2959802D
       Component: Tőrsteuer.FS BRM 0205 
       Component: Tőrsteuer.BF BRM 0205 
    4 Faults Found:
    01134 - Alarm Horn (H12)
                49-00 - No Communications
    01616 - Signal Wire to Interior Monitor
                79-10 - Please Check Fault Codes - Intermittent
    01616 - Signal Wire to Interior Monitor
                49-10 - No Communications - Intermittent
    01616 - Signal Wire to Interior Monitor
                29-10 - Short to Ground - Intermittent
    -------------------------------------------------------------------------------
    Address 77: Telephone        Labels: 8P0-862-335.lbl
       Part No SW: 8P0 862 335 Q    HW: 8P0 862 335 Q
       Component: FSE_255x BT     H26 0350 
       Revision: 00000000    Serial number: 00000005556949
       Coding: 0011822
       Shop #: WSC 00672 785 00200
       VCID: 44D1493FE2816CEB373-50D0
    No fault code found.
    End------(Elapsed Time: 05:59, VBatt start/end: 12.3V/12.2V, udsna)--------

  2. #2
    Benevolent Dictator Uwe's Avatar
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    What reading do you see from the differential pressure sensor in MVB 067.3, with the key on but engine not running, and with the engine idling? Also, what is the offset in MBV 067.4?

    -Uwe-
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  4. #3
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    Quote Originally Posted by Uwe View Post
    What reading do you see from the differential pressure sensor in MVB 067.3, with the key on but engine not running, and with the engine idling? Also, what is the offset in MBV 067.4?

    -Uwe-
    Ignition on, engine off:
    MBV 067.3 = 12.75 Press. Difference Particle Filter
    MBV 067.4 = -15.30 Press. Difference Offset

    Engine idling from cold:
    Exactly the same

    Engine at 2000rpm at standstill from cold:
    MBV 067.3 = 10.20
    MBV 067.4 = -15.30

  5. #4
    Benevolent Dictator Uwe's Avatar
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    Quote Originally Posted by avisonjohn View Post
    Ignition on, engine off:
    MBV 067.3 = 12.75 Press. Difference Particle Filter
    MBV 067.4 = -15.30 Press. Difference Offset

    Engine idling from cold:
    Exactly the same
    Those readings are not plausible for a properly working differential pressure sensor. If it was mine, the first thing I would do is check for blocked tubes.

    -Uwe-
    Lock-down of sick people: Quarantine
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  6. #5
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    Quote Originally Posted by Uwe View Post
    Those readings are not plausible for a properly working differential pressure sensor. If it was mine, the first thing I would do is check for blocked tubes.

    -Uwe-
    Ive put an air compressor down both tubes to clear them out as suggested by another user and they seem clear. Can hear the air filling up in something metallic so assuming the DPF and have fed plastic line down them and there's no resistance suggesting a blockage.

    The current sensor, and the previous one, were brand new.

    Ill put the other sensors back on and see if the readings change if that'll help?

    If I disconnect the sensor and leave engine running, should I be able to hear or feel any suction of pressure from the pipes?

  7. #6
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    Quote Originally Posted by Uwe View Post
    Those readings are not plausible for a properly working differential pressure sensor. If it was mine, the first thing I would do is check for blocked tubes.

    -Uwe-
    In addition to my last reply, if I rmeove the plug from the sensor and check the MBV, it shows 15.30, and - 15.30 for 067.3 and 067.4

  8. #7
    Benevolent Dictator Uwe's Avatar
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    I'm not sure what's going on there, but makes no sense that 067.3 does not change between key on / engine off vs. at idle, and then actually decreases as you increase the RPM.

    -Uwe-
    Lock-down of sick people: Quarantine
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  10. #8
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    What sort of values should I be expecting to see?
    I plugged the old sensor back in and left the hoses disconnected and the value were not much different. 067.4 did not seem to change at all.
    067.3 changed only when I blew into the outlet on the sensor

    I'll see if I can get some videos done if it helps - maybe I'm just not doing something correctly?

  11. #9
    Benevolent Dictator Uwe's Avatar
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    With a properly adapted sensor, I would expect to see 0 mbar with the key on, engine not running.
    I would expect to see a few mbar with the engine idling.
    I would expect to see the pressure rise as the engine rpm and/or load increases.

    But I don't see how a lack of proper adaptation can possibly explain what you're reporting.

    The input tube that comes from in front of the DPF. Apply some pressure (use a clean piece of tubing and your mouth). What happens to the reading?

    Does this car have a functioning DPF? Or is it possible that someone gutted it?

    -Uwe-
    Lock-down of sick people: Quarantine
    Lock-down of healthy people: Tyranny

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  13. #10
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    OK, so here is a quick 90 second video showing what happens with the values.
    Now, from engine off to engine on, the MBV 067.3 goes from 12.75, down to 10.20
    When I increase the RPM (as seen in the video), it can go as low as 7.65 and 5.10, then back up to 10.20 when I let off the throttle and let it idle.


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