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Old 6th August 2009, 12:22 PM
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Default Location of G85 Steering Angle Sensor please

Having had the steering wheel on and off a few times to test fit the R8 offering, I got the usual fault codes which I simply cleared with Vagcom thinking that they would all go away once everything was properly wired up again.

However, I am left with "00778 - Steering Angle Sensor (G85): Faulty - Intermittent". Either this needs recalibrating or is faulty (hopefully the former).

But before I go down this road, I need to understand where this sensor is located. If it's within the steering wheel gubbins, then it's likely that it's related to my fiddling around with the steering wheels on and off. If the sensor is on a road wheel however, then it may just be one of those coincidences and needs further investigation.

Gee, what a longwinded way to ask "does anyone know the location of the G85 Steering Angle Sensor please?"...!
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Last edited by CliveH; 6th August 2009 at 12:24 PM.
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Old 6th August 2009, 07:57 PM
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The steering angle sensor, on your facelift car, is built into the slip rings just behind the steering wheel. Late pre-facelift cars with the optional ESP have it as a seperate module towards the very bottom of the steering column near the pedals.

This excellent article from Paul Waterloo discusses retrofitting a tiptronic steering wheel, and in doing so he covers off the ESP calibration issue, and at the very bottom gives a direct link to the pretty simple procedure on the ross-tech site for re-calibrating it with Vag com....

http://www.audipages.com/upgrades/tiptronicwheel.html

It shouldnt need recalibrating really if you've just put the old wheel back on, unless the slip ring has managed to get turned independently of the steering column at some point and so is no longer correctly calibrated...

HTH
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The Family Wagon - 2018 Tesla Model X. Black, 7 Seats, Towbar, Homelink, Enhanced Auto pilot with Summon and self park, Heated front seats, CCS Charger upgrade, MCU2 Upgrade, Falconwing Doors, Self opening / closing doors, Netflix, Spotify, toys, Air suspension, alcantara roof + lots of other stuff......

The 17 year old Driver Wagon 2015 Skoda Citigo Monte Carlo. Alloys, Power steering, Aircon, Leccy windows, Sat Nav, bluetooth, central locking, cup holders, 59 whole bhp. Million times better than my first car. Well jealous.....

The First 20 Audis:

2001 D2 4.2 QS Silver, 1997 D2 S8 Silver, 1999 D2 4.2 Silver, 2002 D2 S8 Dolphin Grey,
2003 C5 RS6 Blue, 1998 D2 S8 Black, 2000 D2 4.2 QS/S8 Ming Blue, 2003 D3 4.2 Ming Blue,
2005 B7 S4 Blue, 2006 D3 3.0 Tdi Black, 1999 D2 4.2 Silver, 2003 D3 4.2 LPG Crystal Blue,
2000 D2 S8 Silver, 2007 3.0 Tdi Q7 Black, 2009 B8 S4 Black, 1998 D2 S8 Agate Grey,
2006 D3 4.2 Tdi Blue, 2006 D3 S8, 2007 Q7 3.0 Tdi, 2006 C6 S6,

The Second 20 Audis:

2011 A7 Sline, 2001 A2 1.4 Tdi Black, 2002 A2 1.4 Tdi Silver, 2006 A8 4.2 Tdi Blue,
2007 4.2 Tdi Q7, 2006 S4 Cab Silver, 2010 RS6 Saloon Black , 2007 TT Roadster,
2010 A8 D4 4.2 Silver, 2006 C6 A6 2.7 Tdi Quattro, 2000 D2 4.2 QS/S8 Ming Blue (again), 2008 Q7 4.2 Black,
2009 C6 RS6 Saloon Daytona Grey, 2001 Fully Loaded A2 Tdi, 2006 Avant S6 Black, 2007 VW Caravelle Exec Black (almost an Audi)
2009 TT Roadster Daytona, 2015 Q7 4.2 tdi lava grey, 2002 GmbH D2 demonstrator, 2006 D3 A8 LWB 4.2 Tdi Black

Most Recent Audis:

2001 A2 1.4 Tdi Black, 2007 4.2 FSi Q7 ABT Blue, 2016 S5 Coupe Launch model, 2004 S4 B6 Cabriolet, 2016 Q7 Sline White, 2006 Q7 4.2 FSi Black, 2012 Q7 Sline+ 4.2Tdi White, 2008 Blue Audi S8

Everything Else

1989 Subaru Justy, 1986 Vauxhall Cartlton 2.0 GL, 1985 Vauxhall Carlton 2.2 CDi, 1987 Ford Sierra XR4x4, 1983 Vauxhall Senator, 1985 Vauxhall Senator 3.0i, 1997 Polo Saloon, 1997 Peugeot 306 1.9 TDi, Ford Sierra Sapphire 2000E, 1990 Subaru Justy, 2000 Subaru Impreza, 2000 Subaru Impreza RB5, 1993 Range Rover LSE, 2005 VW Bora, 2003 Skoda Superb, 2003 VW Passat V6 4 Motion, 1996 Peugeot 106, 2000 Range Rover 4.0, 2019 Tesla Model 3 Performance
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  #3  
Old 6th August 2009, 08:17 PM
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CliveH CliveH is offline
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Default Thanks Ian!

Excellent stuff as always Ian, many thanks!

I did find the Vagcom procedure, but when searching for an answer to the original question, I also found an article (based on the TT) which mentioned that there are marks on the wheel and steering column which should be in line - although it does feel straight, I think I'll whip everything off again just to make sure before I try the recalibration procedure, as the warning lights (and fault codes) are still coming back...
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Present: S4 B8 avant, fully loaded, MRC Stage2, Milltek non-res, KW springs
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Old 6th August 2009, 08:24 PM
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It could always be 360 degrees out.... This is the nomal cause of issues...

See Pauls notes on the 'window' and the black/grey/gold markings...

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For parts enquiries and Forum User Administration please contact customer services directly, not me - enquiry@a8parts.co.uk, www.a8parts.co.uk, or call 01642 783537

The Daily Town Car - 2023 Tesla Model Y Performance. Black with Black. Giant ipad screen, huge sunroof, 4 wheel drive, Tow bar, lots of ooomph and made in China, so actually built properly unlike the Californian ones.

The Family Wagon - 2018 Tesla Model X. Black, 7 Seats, Towbar, Homelink, Enhanced Auto pilot with Summon and self park, Heated front seats, CCS Charger upgrade, MCU2 Upgrade, Falconwing Doors, Self opening / closing doors, Netflix, Spotify, toys, Air suspension, alcantara roof + lots of other stuff......

The 17 year old Driver Wagon 2015 Skoda Citigo Monte Carlo. Alloys, Power steering, Aircon, Leccy windows, Sat Nav, bluetooth, central locking, cup holders, 59 whole bhp. Million times better than my first car. Well jealous.....

The First 20 Audis:

2001 D2 4.2 QS Silver, 1997 D2 S8 Silver, 1999 D2 4.2 Silver, 2002 D2 S8 Dolphin Grey,
2003 C5 RS6 Blue, 1998 D2 S8 Black, 2000 D2 4.2 QS/S8 Ming Blue, 2003 D3 4.2 Ming Blue,
2005 B7 S4 Blue, 2006 D3 3.0 Tdi Black, 1999 D2 4.2 Silver, 2003 D3 4.2 LPG Crystal Blue,
2000 D2 S8 Silver, 2007 3.0 Tdi Q7 Black, 2009 B8 S4 Black, 1998 D2 S8 Agate Grey,
2006 D3 4.2 Tdi Blue, 2006 D3 S8, 2007 Q7 3.0 Tdi, 2006 C6 S6,

The Second 20 Audis:

2011 A7 Sline, 2001 A2 1.4 Tdi Black, 2002 A2 1.4 Tdi Silver, 2006 A8 4.2 Tdi Blue,
2007 4.2 Tdi Q7, 2006 S4 Cab Silver, 2010 RS6 Saloon Black , 2007 TT Roadster,
2010 A8 D4 4.2 Silver, 2006 C6 A6 2.7 Tdi Quattro, 2000 D2 4.2 QS/S8 Ming Blue (again), 2008 Q7 4.2 Black,
2009 C6 RS6 Saloon Daytona Grey, 2001 Fully Loaded A2 Tdi, 2006 Avant S6 Black, 2007 VW Caravelle Exec Black (almost an Audi)
2009 TT Roadster Daytona, 2015 Q7 4.2 tdi lava grey, 2002 GmbH D2 demonstrator, 2006 D3 A8 LWB 4.2 Tdi Black

Most Recent Audis:

2001 A2 1.4 Tdi Black, 2007 4.2 FSi Q7 ABT Blue, 2016 S5 Coupe Launch model, 2004 S4 B6 Cabriolet, 2016 Q7 Sline White, 2006 Q7 4.2 FSi Black, 2012 Q7 Sline+ 4.2Tdi White, 2008 Blue Audi S8

Everything Else

1989 Subaru Justy, 1986 Vauxhall Cartlton 2.0 GL, 1985 Vauxhall Carlton 2.2 CDi, 1987 Ford Sierra XR4x4, 1983 Vauxhall Senator, 1985 Vauxhall Senator 3.0i, 1997 Polo Saloon, 1997 Peugeot 306 1.9 TDi, Ford Sierra Sapphire 2000E, 1990 Subaru Justy, 2000 Subaru Impreza, 2000 Subaru Impreza RB5, 1993 Range Rover LSE, 2005 VW Bora, 2003 Skoda Superb, 2003 VW Passat V6 4 Motion, 1996 Peugeot 106, 2000 Range Rover 4.0, 2019 Tesla Model 3 Performance
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  #5  
Old 9th August 2009, 10:59 AM
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CliveH CliveH is offline
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Default Sorted!

Thanks to Ian's help (who was spot on with the diagnosis!), I have now resolved this little problem. As there were some slight differences to the illustrations shown in the Audipages article, I will add my own short 'how to' here...



1. No prizes for guessing that this is how it looks before anything is removed The 2 screws securing the airbag to the wheel are located behind the wheel and can be clearly seen in the next photo.
On my wheel, they are Torx T27 but on others apparently T30.



2. Here you can see the 2 screws protruding from the rear of the wheel (they are held in place by a washer once the airbag is removed, so you don't need to worry about them dropping out).
The airbag is connected to the wheel in 3 locations (in the multifunction/tiptronic version). Only 1 is shown in this photo.
You can also see the cable which connects the slipring to the wheel here. This needs to be disconnected from the wheel before removal.
The large nut that you can see in the centre secures the wheel to the steering column. This is removed using a 12mm splined socket. A T55 Torx apparently does the same job.



3. Wheel now removed and slip ring visible. In order to see the 'window', the top column cover has to be removed. This is secured by 2 screws located on either underside of the column as shown in the next photo.


4. A small phillips screwdriver removes these (at least on my model).



5. Here you can see the gold colour in the window - this is the correct, 0degree, position of the slip ring.
For those of you who have read the Audipages article, the first thing you will notice is that there is no 2o'clock position marker on the slip ring. Instead, there is an 11o'clock marker, which has unfortunately been obliterated by the flash although it is partly visible in photo 6 (a bizarre design as the 2o'clock marker makes so much more sense as you actually have something to line it up with, ie the window!



6. Here, the window has changed to what I would call 'half-gold' - this is the 360degree position (a full turn to the right).



7. Here, the window has changed to black - this is the 720degree position (a further full turn to the right).


As we all know from the best written manuals, reinstallation is the reverse of removal, but here are the key points :

With the slipring in the correct (gold window) position and centred (using either the 11o'clock or 2o'clock markers), refit the column cover and then centre the wheel on the spline and secure with the nut until tight and with the markers on the nut lined up as shown in photo 2.

Reconnect the slipring cable and the airbag connectors to the wheel before resecuring the airbag with the 2 Torx screws from behind the wheel.

The ESP and ABS warning lights in the dash should now go out when you restart the engine. If they don't then either :-

- the slipring is not in the gold 0degree position;
- the steering angle sensor (G85) needs recalibrating using Vagcom (VCDS) following the procedure here http://www.ross-tech.com/vag-com/car...ringangle.html ; or
- the sensor is broken

If the airbag light comes on then you need to clear it using Vagcom. If it still remains on, then you have a loose connection or other electrical fault.

Hope this helps anyone encountering a similar problem.
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Present: S4 B8 avant, fully loaded, MRC Stage2, Milltek non-res, KW springs
Past: S8 D2 FL, S2 ABY coupe, RS6 C5 saloon, RS4 B7 saloon, S4 B5 saloon, S4 B6 avant, all gone but not forgotten

Last edited by CliveH; 9th August 2009 at 12:11 PM. Reason: More detail
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