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So the diagnosis is the wiring loom has been fried. The damage starts from the cig lighter socket wiring and goes far into the rest of the loom. Seems that the start of the fault could relate to my use of a sat nav plugged into that socket (?). Why the fuse didnt blow and protect the wiring is...

Thanks for that. Its with the local garage at the moment and I'll pass this on and let you know how it goes Cheers Andy

Having left my 04 A6 2.5 TDI Avant for a few hours I returned to find that the central locking wasnt working. On opening the drivers door with the key there was a strong smell of burning and on removing the fuse box cover I found the cig lighter fuse had melted and there was arching across the...

Thanks for the suggestion. I've actually had a lot of local help. This has included approx 16 hours at two Audi dealers with their Audi diagnostic software and 'expertise' (unable to diagnose problem and then concluded they couldnt support cars as old as mine !) I've also had a lot of help from...

Bruce, Thanks. Its a registered copy of VAG COM following success with the shareware version. However, as you guessed, its a cheaper interface lead. Trouble is even if I purchased the real things I'm still lost for a way forward

Right - finally got the sensors changed for genuine Audi parts but still the same problem. Cant communicate usign VAG COM apart from reading error codes and that tells me there is an intermittent fault on both rear sensors i.e. the new, replaced ones ! Had the sensor targets re-checked and...

Update. ECU has been tested as OK. When I disconect either rear sensor the ABS coming on a low speed problem seems to go away. Still cant communicate with the ECU fully using VAG-COM.

the story continues here... http://www.audi-sport.net/vb/showthread.php?p=721395#post721395

Thanks - think youre right. I'll try that and post the results. Any ideas where the cheapest source of OEM stuff is ? I'll have a Google-around

The plot thickens... I've just had the ABS ECU tested and am told there are no faults. So why cant I communicate fully with it and why do I still have a problem ? Help ! Thanks

So I'm thinking I'll 1) get the ABS ECU tested 2) look at some OEM sensors I'll post the findings Thanks agains

Sounds like a similar problem. The sensors were not Audi parts - paid about £35 each for them. I'll disconnect the sensors at the connector and see what happens. Will this bring up any other error messages ? Thanks for the thought though - its give me something simple to try.

Yeah - the intermittant fault on two new sensors does seem odd. I'd wondered about a controller fault or a wiring fault as they would be common to both sensors. I'm using a full version of VAG COM - release 409-1 having successfully used the shareware version to read the error codes.

Thanks for the view. The sensors were the correct part numbers and from different suppliers so my first thought was it is unlikely that there was a common failure. Likewise with the wiring. However, is there any way of testing either the sensors or the wiring or is the only 'test' to buy...

I've postes the Auto Scan Results below. Seem to have problems communicating with some of the modules. The full story can be found here: http://www.audi-sport.net/vb/showthread.php?p=709595#post709595. But as I needed some specific VAG COM help I created this thread. In summary: I got the...

Thanks Will post details shortly

In an attempt to solve an ABS problem (http://www.audi-sport.net/vb/showthread.php?p=:709595#post709595) I've bought VAG COM but am having a few difficulties Tried to do an output test on the ABS but am getting a few problems: - either "no response from controller" or - says tests complete but...

Thanks again for the help. I've goy myself VAG com and it is showing intermitant faults on the two rear sensors (i.e the new ones that I fitted !) VAG COM indicates all the wheels are reading the same speed. Tried to do an output test but am getting a few problems: - either "no response from...

After living with this for months I've had enough and need to resurect the fault finding. Sensor rings have checked out OK. Worth changing the pump module itself ? Is this a big job ? Any other testing I can do before swapping the pump ? Thanks in anticipation

I'll have a look at the rings. Update on problem: Drove to work this morning - ABS came on at low speed as before. After a few miles it stopped coming on and no warning light i.e. all seemed OK. However, I then noticed a rapid ticking from the general direction of the ABS pump/controller...