The air compressor is on the passenger side front but behind the fog lamp.
You may be able to take the grill out and check it’s function. You should know when it’s running.
The passenger side on the firewall area behind the guard lives the valve block which controls where all the stored air goes. This is also a fail point of the system.
You’ll have to hunt it down but this will be harder without the scan tool
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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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