ESP Sensor Unit G419

[TimA6QSline]

Hi,
A6 2.7 TDI Q 2006. Had traction light and 'ESP Fault' come up a few times intermittantly in quick succession followed by it becoming a permanent 'feature'. No other warning lights etc. Bit of a panic as MOT due in a month and have realised that this would now cause a fail.

VCDS scan is showing the following faults:
ddress 01: Engine Labels: Redir Fail!
Part No SW: 4F1 910 401 HW: 4F0 907 401 C
Component: 2.7L V6TDI G000AG 0020
Revision: --H02--- Serial number:
Coding: 0011372
Shop #: WSC 00618 210 91848
VCID: DABF165B693B
1 Fault Found:
005715 - Please check DTC Memory of ABS Controller
P1653 - 002 - Lower Limit Exceeded
Freeze Frame:
Fault Status: 01100010
Fault Priority: 0
Fault Frequency: 2
Mileage: 156176 km
Time Indication: 0
Date: 2013.05.30
Time: 21:58:38
Freeze Frame:
RPM: 0 /min
Torque: 0.0 Nm
Speed: 0.0 km/h
Duty Cycle: 1.0 %
Voltage: 11.40 V
Bin. Bits: 00101000
Torque: 62.4 Nm
Readiness: 0 0 1 1 1

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 4F0-910-517.lbl
Part No SW: 4F0 910 517 L HW: 4F0 614 517 L
Component: ESP 8.0 quattro H05 0090
Revision: 00000000 Serial number: 00000000000000
Coding: 0020876
Shop #: WSC 02325 785 00200
VCID: 2D550D87C835
1 Fault Found:
00493 - ESP-Sensor Unit (G419)
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 2
Fault Frequency: 1
Reset counter: 223
Mileage: 156176 km
Time Indication: 0
Date: 2013.05.30
Time: 21:58:58
Freeze Frame:
Hex Value: 0x0000
Hex Value: 0x02A2
Hex Value: 0x0043
Hex Value: 0x018B
Hex Value: 0x00FF

From what I can find out, it would seem that the first fault listed is actually due to the second one. Can anyone confirm this theory?
If this is correct should I assume that the ESP sensor is faulty? I've read a variety of reports about where this sensor is located with the majority saying it is under the centre console somewhere.

Any one else had a similar problem, advice on where it actually is and how to get at it, part no/code, best place for replacement (dealers?), idea of costs (no doubt it's £££££)

all assistance greatly received.

[Guest 2]

First fault is caused by the second.

00493 - Ross-Tech Wiki

Look under the heading no signal/communication.


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[MarkTM]

Had a similar problem with my Jag which led to me cleaning and then replacing all sensors and wiring looms.

To no avail and eventually sent the ABS pump ECU to this guy:

ECUSOLUTIONSWALES Contact Us

48hr turnaround and all now works as it should, cost was £99 plus £8 for a next day courier return.

Unsure if he repairs Audi units though and it may be cheaper if you have the part no to buy a new or used unit from dealer/ebay?

[TimA6QSline]

Thanks both. Chris, any idea of location of both the ESP sensor (G419) and the Brake Electronics (J104) so I can check connections etc. cheers

[Alan02]

Hi G419 is located under the centre consul. The unit must be secure but not over-stressed on the mounting pionts (10NM), and handle it carefully.
J104 is the ABS hydraulic unit under the bonnet.
I would only pull any connectors to check once the Ignition is OFF and wait a minute or two, this will stop any further fault codes showing up while checking the systems.

[gupsterg]

A visual aid on G419 Link:- Audi Portal: Sensors Diagnostic . Audi A6 4F (2005- ). G419

Item 1 is J104 in this link:- Anti-locking brake syst. -abs-. Fits: 2010 Audi A6 | Jim Ellis Audi Parts

[TimA6QSline]

Thanks for the advice and especially A6_Chris for the docs. Before I take the plunge and start ripping the car apart,has anyone else experienced this fault and successfully fixed it by swapping this sensor? Worried about it turning into one of those jobs where you go through a lot of pain and cost to swap one part only to find the fault was actually elsewhere....

[TimA6QSline]

Well, couldn't find a suitable 2nd hand sensor to try so had to go for a new one - ouch! Sensor was the bargain price of £540 plus vat and Auditechnik in Gloucester did the job in 1.5hours. Thoroughly recommend these chaps - helpful, friendly, and reasonably priced.

[MarkTM]

Ouch that's painful!