One problem related to front suspension has been reported for the 2003 Audi Quattro. The most recently reported issues are listed below.
Air suspension for Audi allroad failed. All air was vented out of the front suspension without warning resulting in loss of vehicle control when car hit a bump/dip in the road. Car seemed to bounce off the front tires and was a violent compression and rebound. I momentarily lost control and did not know what happened until pulling over and discovered front of car was sitting on the tires. I restarted car after several failed attempts to use the ride height leveling system controls and noticed all three ride height leveling lights flashing and then a suspension light flashing on operator console that was not laminated until after restart of car. After the incident the air compressor reputedly failed to inflate front shocks. This took place aprox. 2 miles from my home on wonder wood expressway. In jacksonville FL. Car is now at residence. Un-drivable. Contacting dealer!.