This will likely be your air suspension compressor. It turns off when the car comes to a stop. It also pumps out a jet of air through the outlet to purge the air dryer.
As the compressor ages and it’s piston ring gets worn, it will become noisier.
Mike
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04 A8 - 4.2 Sport
Indigo Leather Sports Seats - Sports wheel - Sports Air Suspension
Auto Boot - Double Glazing - AMI - Solar roof
TV - Bose - Voice Control - TPMS - AFS- TINT
Power Blind, Fingerprint - Light package (in and out)
Retrofits:
OEM Auto headlights & rain sensing wipers
OEM Bluetooth phone
Bluetooth Audio Streaming
Reverse Camera
OEM Aluminium Package
Auto boot close using remote/door button
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