I am Maarten from Amsterdam, NL. I drive a 2003 Cayenne turbo that has a faulty air suspension. I had the yellow "airsuspension faulty" message a couple of times over the last two years but now the car "lies on the floor" with a red airsuspension warning.
Compressor is not running, when I connect the spare tire hose: no pressure either. When I bench-test the compressor directly it runs fine. At that point I decided I need a diagnostics computer and bought a Durametric kit.
I get the following error messages from the Level Control module:
2250 (valve operating time exceeded, upper limi