The first thing I noticed about my car after I bought it was the radio volume would go up and down by itself with slight increase or decrease of throttle. After much research, I found out this is a Bose Audio Pilot problem and that the hidden microphone in the overhead console area was too sensitive. This is especially a problem with a louder exhaust(like mine, AWE non-res). At 35mph or so, you could drastically change the volume just by putting a load on the engine, either by throttle or just going up a slight grade while in a higher gear. Once you released the load or throttle, it would drastically drop off. Another example of when this happens is when I would be decelerating using the engine compression, as the exhaust got louder as the engine winded down, the volume would shoot up, then when I came to a stop, it would cut way back. This is not speed related, it is internal cabin noise related, and supposedly the Bose compensates at the frequency of the perceived noise. This drove me nuts! Anyway, there is a TSB for this, I believe it only affects us B6's. I told the dealer that I wanted this TSB done, I even printed it out and took it with me to be sure. It took about 2 hours and now I can listen to the stereo again! Anyone with this problem should get this mod done! They disable the Audio Pilot, and re-enable the speed sensitive volume, which can then be shut off if desired. The TSB is Group 91; Number 04-17. You can do it yourself with the jumper wire kit and someone with a VAG.
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