Hello, friends. There is a problem with the air suspension, and I can't figure out why. After driving for 20-30 kilometers on the highway, and then turning off the engine (for example, at a gas station) and starting it again, the "air suspension malfunction" error appears on the dashboard. The vehicle's ground clearance remains unchanged and is in its normal position. The suspension does not rise or fall, and the air struts maintain the vehicle's stability. However, when this error occurs, the shock absorbers switch to a stiffer setting. It's very uncomfortable to drive, like riding a cart. When I read the computer, there's only one general error: "Incorrect pressure data from the reservoir sensor." It's probably related to the air pressure in the system (or maybe not, as it's a general error). When I drive around town and restart the engine, there's no error, and it works fine. The compressor is working properly, as I replaced it last year. The body position sensors are functioning correctly. What could be the cause?

 

Solenoid block next to reservoir? Or solenoids themselves? IT COULD BE that computer reacts to lack/excessive pressure change in the tank when solenoids are open; intermittent malfunction in the pressure sensor itself or channels leading to it.
All above are conjectures, and are not based on experience.

 

Had that on one friend 2007 tdvi. Driving fine stopped for an hour at a slight incline and uneven side of the road jumped into stiff transport mode.
Have a look and test the connectors to each strut.
airpressure sensor to the valve block.
I always mention tje it is worth changing or drying the dessicant beads in the compressor to get rid of the humid air as much as possible

 

The other problem I had on mine car got very high 440mm and super stiif almost jumping . There were 2 hight sensors shot