A8 Air suspension light is on

[zipzz]

Hi, I am a newbie to the forum and hoping all the collective expertise of the readers can help me. I have a 2008 A8 whose Air supension/Level control light has come on "Amber" and stays like that. I ran the VAGCOM diagnostics and got the following errors. After clearing the errors, the 01770 disappeared but the light remained on, and the 00668 was still there.

Any ideas what could be wrong? History wise I have had some issues with electrics - a humming (annoying) rear speaker which did not go away even after replacement. The car went through an MOT two days ago and required a wheel change in my absence. If they hadnt used Jacking mode, could that have caused the problem?

Any help much appreciated.

Thanks

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Address 34: Level Control Labels: 4E0-910-553.lbl
Part No SW: 4E0 910 553 L HW: 4E0 907 553 H
Component: LUFTFDR.-CDC H07 6340
Coding: 0015510
Shop #: WSC 02313 785 00200

2 Faults Found:
01770 - Temperature Sensor for Level Control Pump/Compressor (G290)
007 - Short to Ground - Intermittent
Freeze Frame:
Fault Status: 00100111
Fault Priority: 4
Fault Frequency: 1
Reset counter: 168
Mileage: 65895 km
Time Indication: 0
Date: 2011.04.11
Time: 07:45:22

00668 - Supply Voltage Terminal 30
009 - Open or Short to Ground
Freeze Frame:
Fault Status: 11101001
Fault Priority: 2
Fault Frequency: 1
Reset counter: 106
Mileage: 65919 km
Time Indication: 0
Date: 2011.04.11
Time: 22:55:47

[baylissboy]

I've had a couple where the relay sticks & causes the compressor to run until it seizes, there's a TPI for it. If that's the fault you'll need a relay, fuse & compressor, all of which will add up to a small fortune.

[zipzz]

Thanks baylissboy...fingers crossed. I would have opened the dashboard to check the fuse and relay - but dont have the confidence. Taking it to st**lers Tuesday. I hope its just the fuse/relay and not the pump itself which has burnt out.

[zipzz]

Funnily enough when after reaching home yesterday when I switched off the car, and walked around it - I heard a noise like it was coming from a compressor but at the rear-near-side of the car close to the boot.

Isnt that the location of the air reservoir for the Adaptive system?

I am foxed as to why it should sound like a compressor and whether this means my pump is functioning ok?

The car also seems to be at raised level although I have no means of verifying this since in the MMI - the raise position is greyed out. The Comfort, Dynamic, Authomatic positions are available - however selecting any of them doesnt seem to make any difference.

Any ideas where the relay/fuse for the compressor might be? I thinks its the driver side footwell but not sure how to get to it?

[zipzz]

Solved - I did some more digging on various websites and looked through the MWBs for the Air-suspension module. The 00668 terminal 30 open was basically due to a blown 40A fuse for the Air suspension compressor. To access it one has to remove the lower A-pillar door trim on the passenger side`(no tool required, this can simply be pulled out by hand), roll back the carpet and look in the footwell. There is a big orange fuse which cant be missed. Cost me 3 quid to change. I changed the air-suspension relay as well while everything was opened up. That was 10 quid.

Saved atleast 170 in diagnostic charges of the dealers. Possibly more - because they could have easily come up with a "we need to replace the pump".

Thanks everyone and hopefully this thread can help some poor soul in the future.

A few websites which are really helpful to access circuit diagrams and other details are:

http://www.audi-portal.com/en/diagnostic/ecu.html‏http://www.volkspage.net/technik/ssp/index_eng.php/‏

[GlynC]

Hi
My A8 has demonstrated the same symptoms today
I checked the small 10amp fuse in the fuse box and that was ok so I took out the carpet and found the 40amp fuse to be blown. Managed to get a new one from Halfords and fitted that. Checked and everything was working.
After a quick test drive the light came back on ??
I haven't looked any further as the lights fading.
Any ideas ..possibly this relay Zipzz mentioned, Do you have the part number matey? Or is it just a case of visiting the dealers? Where is that located ?
I don't have any noises from anywhere and the suspension was running fine before today when it just packed up as I set about my return journey from Sheffield
Cheers
Glyn

[a8 tech]

the relay output contact bridges and cause the pump to run to destruction but hopefully the fuse protects the pump

replace the relay and fuse but be preprepared to replace the pump if the fuse blows again

[GlynC]

Thanks
I am hoping the pump is ok as it worked ok on the drive and I tested raising and lowering the car with no issues. The fuse went again when I popped out for a quick test drive.
Is the relay nearby the fuse location and easy enough to change?
Cheers
Glyn

[zipzz]

The relay is in the same location as the fuse...under the carpet. There are a few fuses and relay's in this location - the airsuspension one is the bottom most right under the orange fuse. You can see a diagram on erWin - I dont have it at the moment. Its called the J403 relay...Audi parts should be able to supply you one easily.

[GlynC]

Cheers Zipzz
Much appreciated I will head to the dealer tomorrow
Many thanks