How to do G450 adaptation correctly

   #1  

avisonjohn

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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: Tõrsteuer.FS BRM 0205 
   Component: Tõrsteuer.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  

Uwe

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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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avisonjohn

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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-

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
 
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Uwe

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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-
 
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avisonjohn

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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?
 
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avisonjohn

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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
 
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Uwe

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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-
 
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avisonjohn

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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?
 
   #9  

Uwe

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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-
 
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avisonjohn

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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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   #11  

avisonjohn

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Here is another video showing the MBV's with ignition on, engine off, and with me disconnecting and reconnecting different sensors :/
 
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   #12  

Uwe

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15.3 with the sensor disconnected makes perfect sense with a previously adapted offset of -15.30.

Connect the sensor electrically, but don't connect any of the plumbing. Do the Adaptation. You should then have zero in MVB 67.3. Now apply some pressure with your mouth to the upstream input on the sensor and see what happens.

-Uwe-
 
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avisonjohn

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Which is the upstream - the large or smaller outlet?
Also, once I do the adaptation, am I correct then in assuming that the 067.3 or 067.4 should change/reset/zero out?
 
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avisonjohn

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OK, so just done the adaptation again and have these results:
67.3 = 0.00
67.4 = -5.10

I blew into each port on the sensor and got readings on 67.3 which then settled back to 0.00

But now, when I start the engine, 67.3 still stay the same

I would have thought that there would be at least *some* fluctuation in the readings.
Would this be an issue with the DPF itself? The pipes do feel clear when inserting some plastic line, and have blow them out with a compressed air line.
 
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HMC

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Are the pipes on the right way at the DPF?
Regards HMC
 
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avisonjohn

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Are the pipes on the right way at the DPF?
Regards HMC

I can't get to the DPF and have no idea how to access it to check, but I've never touched them myself.
 
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HMC

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I can't get to the DPF and have no idea how to access it to check, but I've never touched them myself.
Perhaps you should do a test with a low pressure gauge at the pipes in the engine bay, so you can rule out the mechanical side.
Regards HMC
 
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avisonjohn

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Perhaps you should do a test with a low pressure gauge at the pipes in the engine bay, so you can rule out the mechanical side.
Regards HMC

Can't believe I haven't thought of that. I'll put a guage on tomorrow and see what I get
 
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avisonjohn

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OK, so put a manometer on the pipes, and each pipe shows zero when engine off, and when idling they both show 0.010psi - 0.020psi, with zero difference between each pipe...
 
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HMC

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Now try it at 3000 rpm and then get someone to block the tail pipe at 3000 rpm and tell us what the pressure is.
Regards HMC
 
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