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i have a 2006 Porsche Cayenne 4.5 V8 Bi-Turbo.
after i parked the car overnight the front suspension goes down and the rear stay up. the display show nothing about a failure. if i start the engine the front goes up and after a short while i hear that by the passenger side airfilterbox the air get short release again. the whole suspension is working perfect only that the fron goes down over night. i sprayed all lines and airbags in with dish liquid to see whether there is a leak but i didn't find anything. can it be that the regulation valve is not proper working or the little valves on the strut?
Just figured i would share. Christmas Day heading down to see the parents i had a loud BANG come from the front left. sounded like i had a rock kick up under the car or something. Completely flat, fresh pavement, so no bumps of any kind around.
Anyways i didn't see anything come out the back of the car and no warning lights so i figured i'd keep driving. Got to my parents, and as i'm pulling in i get a suspension warning. Weird, still same ride height so enjoyed the day with my family.
Coming home, the car was at the loading height in the front. definitely sitting on the bump stops.
Got a replacement from Germany through Miessler for 289 with the new o rings. A STEAL considering sunset wanted 1200.
replacement is pretty easy.
Something to keep in mind. take a look at the aluminum cover that split on me. Mine had cracks for a long time, but never really though anything of it.
I am owner of Cayenne S 03'. From few days an error message pops-up on car display "Air suspension warrning". I connected it to the computer and it is shown as P1400 - control position not adjustable.
My observation are the following:
1.There is no problem with going for higher position (for example from normal to terrain).
2. There is no error while I am riding on terrain level and not exceeding a speed which is lowering the car. After exceeding this speed car is starting to go down and error pop-ups.
3. Error is shown only while lowering the car.
4. Front suspension is lowering without any problem, it applies only for rear.
5. When error pop-ups I can see that front suspension is much lower then rear.
6. It only only applies to front/rear relation. I can not see any difference between right/left.
Local workshop pointed it as a compressor problem, but in my opinion it is rather some kind of valve responsible for releasing the pressure then compressor, as I can not see problems with getting car higher. Just with going for lower position.
I will be very thankfull for your opinion as a specialists, as nearest Porsche dedicated workshop is like 300km from the place where I live.