I would suggest you do a google search for "Botangs Hole", essentially its located underneath the ECU box and is made of paper. it eventually fails leading to water getting into the car on the passenger side.
http://forum.a8parts.co.uk/showthread.php?t=3281
http://forum.a8parts.co.uk/showthread.php?t=7645
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Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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