squishball

I've been experiencing intermitten dash MILs (ABS, EPC, Suspension, plus the manual lights above suspension buttons). The MILs typically appear after 30 min - 1 hr of driving, and generally occur after a stint on the freeway. I suspect it may have something to do with not having to engage the brakes while on the freeway, because city driving doesn't result in the MILs. Brake pads are fine, but rotors are worn with a lip. I was hoping the MILs were related to my failing front 2 air springs, but replacing them didn't solve the problem. Vag-com gives the following DTC, but I can't locate the codes in the bentley shop manual. Any hints would be much appreciated. Thanks.

Address 03: ABS Brakes Labels: 8D0-907-389.lbl
Part No: 4Z7 907 389
Component: ABS/ESP allrad D57
Coding: 06395
Shop #: WSC 02325

1 Fault Found:
00778 - Steering Angle Sensor (G85)
27-10 - Implausible Signal - Intermittent


Address 34: Level Control Labels: 4Z7-907-553.lbl
Part No: 4Z7 907 553 B
Component: - 2C1A1 X031
Coding: 25500
Shop #: WSC 09999

2 Faults Found:
01316 - ABS Control Module
79-10 - Please Check Fault Codes - Intermittent
01575 - Control Switched Off
35-00 - -

paulroad

The steering angle sensor.

This is part of the ESP and in effect if you are steering of course..starting a slide, or spin the system will trigger the ABS to bring you back into a safe path.

If the angle sensor is intermittent, then it can be triggering the system that there is a problem and the ABS can't fix it....domino effect.

Judge AR

<ul><li><a href="http://allroadfaq.com/content/resolutions/brlghtsw.shtml">http://allroadfaq.com/content/resolutions/brlghtsw.shtml</a</li></ul>

2002ar

I can't find the codes, either. Are you using a Ross-Tech or Audi diagnostic tool?

kingfishgrapejam

2nd it's cheap enough to try.

Boston Driver

<a href="http://wiki.ross-tech.com/index.php/00778">code 00778</a> in ROss Tech's Wiki says:

Possible Causes
Steering Angle Sensor (G85) Basic Setting lost
Steering Angle Sensor (G85) Installation Position incorrect
No Communication between Steering Angle Sensor (G85) and Brake Electronics (J104)

plus <a href="http://wiki.ross-tech.com/index.php/01316">code 01316</a> says

Possible Causes
Wiring/Connector(s) from/to ABS Control Module faulty
Fault(s) stored in ABS Control Module

Best of luck tracking down the cause! I hope it is as simple as a brake switch...

squishball

Thank you to everyone for your suggestions. I'll start with the brake light switch.