2014 AUDI S6 Forward Collision Avoidance Adaptive Cruise Control Problems

While driving, received notification of a suspension fault. Was able to drive vehicle home, and found code for suspension C104600. Cleared code, and didn't see it return. Car sat a few days, and next time it was driven, received cascade of MIL warnings for suspension auto leveling failure, auto leveling headlights, adaptive cruise, lane keeping, and auto braking. Console advised to keep speed below 35 MPH. Had to quickly exit the road as result. Limped vehicle home on side roads, found codes across multiple systems. Suspension would not raise, and all coda would immediately return upon clearing. Vehicle was evaluated by local shop, and diagnostics show failed suspension air compressor and relay.