Scan would normally show a fault code. Brake switch is normally the cause. Genuine only replacement suggested if it is and cheapo ones have limited life.
Might help...
http://www.ttforum.co.uk/forum/viewtopic.php?f=2&t=157349
If the underside is well caked check the evaporator drain is clear underneath... No 11
Check the windscreen wiper plastic cover is seated as the rain can run down passed the lip seal and in through the pollen filter...
Ah the TT 49Deg C Trick
http://www.audiworld.com/forums/a6-s6-c5-platform-discussion-7/apparently-secret-a6-climate-control-codes-display-other-info-e-g-speed-rpm-1727602/
Might help ...hows your German?
For anyone else that wants to play whilst sat on the M25 tonight....
Did you lock of the flywheel and pump position?
The pump setting is really fiddly.
Set the pointer mid position and it should start then you need VCDS to do the dynamic timing.
I ended up with a jewelers screw driven as a really fine pry to get the dynamic set...
Bob normally puts a code needed warning on the bag?
http://wiki.ross-tech.com/wiki/index.php/Immobilizer_III_Injection_Pump_Swapping
Most car locksmiths can also pull the code for £50.....
That's what I did and then used VCDS.....
Their pretty well known to the Mk1 TT DSG population and did the tests on my VP44 ECU. Not sure but think they also did the Wheeler Dealer dashpod on TV.
Oh and LUCK!
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