Air Suspension Failure: Allroad Problems (Solution)

Hello, I'm having the following problem with my Allroad from 2003, 120kw, engine code BCZ.

Always stays in the lowest position - The compressor starts running when I press to lift, but nothing happens - There is pressure, about 6 bar.

I have a second, fully functional Allroad available, and I'm using VCDS to compare the diagnostic data. The only difference I've observed (while raising the vehicle) is that on the second car, the rear air suspension valves on the left and right sides are "on" (while the front left and right are "off") until the pressure is correct. Then, the display changes, showing the front left and right air suspension valves as "on" (rear off), and the vehicle reaches the desired height.

"With a faulty suspension system, the air spring valve display shows 'on', the compressor runs continuously, and the vehicle does not lift even a centimeter."

Does anyone have any idea where the cause might be?
Or a troubleshooting guide for air suspension issues using VCDS.

PS car had an accident; the battery was dead for 3 weeks.
I hope I'm in the right department.

Thank you very much .

Is it possible that something was damaged in the accident?
Did it still work after the accident, or did it only stop working after the battery was dead for 3 weeks?

It only started malfunctioning now that I've started using the car. During the repair work, I had to inflate it a few times, and it worked fine then.

The battery was disconnected repeatedly.

It already seems suspicious to me. I've disconnected the battery again. I'll try again tomorrow.

Hi!

If the compressor is running, the air has to go somewhere...
You can actually hear a hissing sound.

Otherwise, when you put a car with air suspension on a lift,
"Actually, a bit of caution is advised."

I'm not sure about the Audi, but I'm certain about the Vito.
A switch needs to be activated beforehand.
Otherwise, something might get damaged.

I found the error!

The compressor didn't have enough power (6 bar).
The car had barely lifted at the rear, and not at all at the front, because it was heavier in the back.
Compressor removed - disassembled - pump and pressure valve thoroughly cleaned - sealed - now working again.
When I connected the compressor, which was already disassembled, to a battery, only a warm puff of air came out of the connection.
Now, it's very difficult to press the opening shut with your finger (now at 8.5 bar).

Basic settings with VCDS, and everything was fine. (It wasn't strictly necessary, but I did it anyway).

It was probably just a coincidence that it happened immediately after the accident/when the battery was disconnected.
Thank you for the feedback!

Thank you for the feedback!