Haldex / 4motion and MOT brake test.

[DarkMatter]

My Audi Q3 Stronic Quattro was MOT tested at an Audi main dealer this week. When I got the car back I ran a VCDS scan and was surprised to see that it had logged a fault with the Haldex / 4motion component.

This fault was not present before the MOT test, the timing of the fault ties in very well with the time at which I think the car was being tested.

I'm wondering whether this fault was generated during the brake testing part of the MOT test, does anyone have experience/knowledge of this happening?

I have cleared the fault code and used the car, the fault code has not returned yet.

Tuesday,24,February,2015,09:46:30:04481
VCDS -- Windows Based VAG/VAS Emulator
VCDS Version: 14.10.1.1 (x64)
Data version: 20150130

Dealer/Shop Name: ACT

VIN: xxxxxxxxxxxxxxxxx   License Plate: xxxxxx - AFTER DEALER VISIT
Mileage: 27920km-17348mi   Repair Order: 
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
Chassis Type: 8U (8U0)
Scan: 01 02 03 08 09 10 15 16 17 19 22 25 42 44 46 52 53 55 56 5F
          62 69 72

VIN: xxxxxxxxxxxxxxxx   Mileage: 27920km-17348miles

01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
10-Park/Steer Assist -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
22-AWD -- Status: Malfunction 0010
25-Immobilizer -- Status: OK 0000
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
53-Parking Brake -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: OK 0000
5F-Information Electr. -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
69-Trailer -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000

-------------------------------------------------------------------------------
Address 22: AWD        Labels: Redir Fail!
   Part No SW: 0BS 907 554 D    HW: 0BS 907 554 D
   Component: Haldex 4Motion      4017  
   Coding: 0000005
   Shop #: WSC 00000 000 00000
   VCID: 479D6E0636BC7519EFA-8012

1 Fault Found:
01155 - Clutch 
            003 - Mechanical Failure - Intermittent
             Freeze Frame:
                    Fault Status: 00100011
                    Fault Priority: 4
                    Fault Frequency: 1
                    Reset counter: 38
                    Mileage: 27822 km
                    Time Indication: 0
                    Date: 2015.02.23
                    Time: 11:49:19


-------------------------------------------------------------------------------

End-------------------------(Elapsed Time: 03:50)--------------------------

Edited by DarkMatter on Thursday 26th February 08:53

[Palmers]

I thought quattro doesnt go on the brake tester? My mate done my MOT and he had this heavy gadget in the footwell to test the brakes. Just take it for a drive slam the brakes and record reading.

[DarkMatter]

Thanks Palmers, maybe I need to ask my Audi dealer about this.

[Lucas Ayde]

Palmers said:

I thought quattro doesnt go on the brake tester? My mate done my MOT and he had this heavy gadget in the footwell to test the brakes. Just take it for a drive slam the brakes and record reading.

Yup - not a good idea if the rolling road brake testing machine only spins a single pair of wheels for the brake test, but the car is AWD....

[tomjol]

Quick bit of Googling of that fault code (strewn with false positives and scare stories though such an exercise is) does not look positive...stories ranging from replacing the pre-charge pump to replacing the whole rear axle setup...

[phumy]

I used to own a quattro turbo and at MOT times it always went on the brake testing rollers, it has a diff (Torsen) between front and rear to allow for the rollers. These brake testing rollers really don't run very fast so the diff would compensate for the different in wheel speeds from front to rear axles.

[DarkMatter]

Thanks for your contributions.

I've been in contact with the Audi dealer who MOT tested my car and they've confirmed that sometimes the MOT brake test does cause that fault code on a quattro model.