Electrical issues

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
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ZacP
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Electrical issues

Post by ZacP » Tue Sep 08, 2015 6:50 pm

Hi guys,

Apologies in advance if this is a stupid question. Loving the 6 having had it for a couple of weeks now but its come up with a few niggles. Im replacing the GPS receiver so the nav works, and I've had to rewire the iPod adaptor, but there are two things that seem intermittent and a little more serious. Namely the cruise control and the parking sensors. Sometimes they work, sometimes they don't.

With the cruise it will (occasionally) engage when asked only to drop with no reason a few minutes later. Sometimes it won't engage at all. Could this be the brake switch or something else?

The parking sensors work fine half the time, but the other half seem to think that your about to hit something IMMEDIATELY after going into reverse and emit a loud screeching beep even though you are nowhere near any obstacle.

Could these be related problems? If so, whats the recommended fix? happy to search for the problem if only someone could point me in the right direction!

Thanks!!

Zac

ahoooga
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Re: Electrical issues

Post by ahoooga » Tue Sep 08, 2015 8:08 pm

Dont know if there related, but the parking sensors is a common one.

You have a duff sensor somewhere, and as soon as its powered ( selecting reverse) it closes ( opens ?) the circuit , making the car think there's an object in the way.

Corrosion/oxidisation on the surface of one of the sensors is the favourite.

If you can VCDS the car it may churn an error up relating to the cruise control problem

bilko1
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Re: Electrical issues

Post by bilko1 » Tue Sep 08, 2015 8:09 pm

Get yourself a copy VCDS and suitable lead and all your questions will be answered. Also you might have a few more after a scan :)
Avus Avant, RNS-E mk2 with sds and Bluetooth, Milltek, Hotchkis, Bilstein, Forge, ITG, A.C.E, Wagner, FBMFSW, MTM.

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Shoppinit
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Re: Electrical issues

Post by Shoppinit » Tue Sep 08, 2015 8:14 pm

The problems aren't related. Lots of things can cause the cruise to stop working. Brake light switch is most likely culprit.
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ZacP
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Re: Electrical issues

Post by ZacP » Wed Sep 09, 2015 2:20 pm

Thanks guys, is the only place to get a VCDS Ros tec? Seems expensive for a lead and some software!

Also, might be an unrelated issue, but the drivivers seat doesn't seem to go as low as the passenger seat. Is this normal?

Installed new GPS receiver today. Have working nav! Simple things...

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Nobby
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Re: Electrical issues

Post by Nobby » Wed Sep 09, 2015 3:35 pm

You can get a cheap lead (from shebay) and use VCDS lite for free. The UK retailers for VCDS is Gendan - its money well spent though. You will get back the money in just a few months of messing around - remember getting a scan at Audi is probably £50 a pop.
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Chrisb25
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Re: Electrical issues

Post by Chrisb25 » Thu Sep 10, 2015 7:37 am

Unless you're close to where I am and I can scan it for you?

ZacP
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Re: Electrical issues

Post by ZacP » Thu Sep 10, 2015 11:49 am

Thanks for the replies. Great to know there is (potentially!) a fix. I'm just off J6 M40. If there is anyone around here with VCDS, I'm happy to come to you!

Maximo
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Re: Electrical issues

Post by Maximo » Thu Sep 10, 2015 4:22 pm

ZacP wrote:Thanks guys, is the only place to get a VCDS Ros tec? Seems expensive for a lead and some software!
Take the car to an Audi dealer and ask them to run a diagnostic, then you'll see how cheap the Ross-Tech cable and software is. It's a very valuable tool to have available to you, especially with these cars. You'll find it very difficult to diagnose faults just by explaining what symptoms you have.
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Daveperc
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Re: Electrical issues

Post by Daveperc » Thu Sep 10, 2015 5:15 pm

Zac

If you are just off J6 on M40, then I'd run the car to just off Jn 11 of M40 and go see the nice chaps at MRC! Not only will they do a proper health check on your car, but then they can fix the issues, and even do you a Stage 1 remap!!

Simples!!

Dave

ahoooga
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Re: Electrical issues

Post by ahoooga » Thu Sep 10, 2015 9:00 pm

What he said :bigblink:

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Nobby
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Re: Electrical issues

Post by Nobby » Thu Sep 10, 2015 9:25 pm

Zac - I'm junction 9 of m40 and have VCDS
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Rule #36 - At least one gear shall be dropped for every tunnel travelled

** NOW AVAILABLE ** C5 RS6 Cambelt Tool kit rental (also fits other models 3.7/4.2 V8 engines)

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