2009 RS6 Avant faults

[GeoWest]

Hey, new to this forum, and recent Audi convert. I have a 2009 RS6 Avant, and getting a couple of errors coming up, couldn't find relevant posts so hoping someone may be able to give a clue as to what may be going on?

- Getting ESP + Park brake fault coming up in combination after approx 5 mins driving, which then doesn't allow the cruise control to work, and Park brake wont engage unless you turn engine off.
- Getting low dip fault also, not sure if these are connected?

any help appreciated, i dont have access to any diagnostic tools, unless i head to dealer 400km away..

[inspectorman63]

You need it scanned; find someone in NZ with VCDS. As well as checking the Audi / VW forums, don't forget the Skoda and maybe even the Seat forums. Or buy it yourself and post the results here for some help. Steer clear of the EBay specials and get a genuine cable. Good luck.

[MarkTM]

ESP and parking brake are usually the first things to report errors if you have a battery on the way out.

With A 2009 it could still have the original battery fitted that'll be coming up on 8yrs old, check that first.

And as Inspector says, get a kosher VCDS cable as it'll pay for itself within a year.

[niall campbell]

if you cannot get it scanned, check battery for dud cell(s) and alternator output under full load, full headlights on & heater going full blast. Alternator should be 14.5 volts, or over 14.0 at least

Battery with engine running should also show 14.3 volts .................. you will get a slight drop, no more than 0.5 volts or you have a fault ......................... jump start terminal under bonnet if warm or very hot can cause resistance

[avibedi]

In fact, in my car these were the first systems going down and the failure was the coolant sensor that went to -40 (found out with a regular OBD2 scanner, not the VAG Cable...

get it scanned to see why it is entering in a fail safe configuration

[GeoWest]

Thanks all for your comments, ended up being a couple of wires had worn through, so relatively simple fix.

[MarkTM]

Geo, it may help the community (and anyone with a similar fault manifestation) if you actually shared where the worn wires were

ESP & EPB maybe caused by a worn brake loom, however the dipped beam would be sommat different.

[GeoWest]

MarkTM,

see below on the mechanics invoice, got them to sort while in for service. hope this helps?

Headlight range fault:
Rear sensor wiring open circuit - wiring damaged. Repaired and tested - OK
ABS fault :
Right rear sensor circuit issue. Swap sensor to front to check - OK. Wiring on rear damaged - repaired and
tested - OK
Park brake fault:
Intermittent communication fault with ABS. Cleared codes and appears to be working - could have been
triggered ABS fault with wiring.