Basic adjustment of the air suspension after lowering with coupling rods not possible

Hello together! Maybe someone can help me here… I took the Phaeton on the lift yesterday to do some things… new xenon burners, new tire pressure sensors etc., among other things I installed new coupling bars on the level sensors so that it comes down a bit lower and the software solution via vcds is not enough for me. Now to the problem: car taken off the stage is so good. I then drove a lap and have all settings once played through… high, down, hard and soft… it came short the error message error level workshop… after I turned off the ignition and again the message was gone… I finally measured again from each wheel… (wheel nut to bottom of the blade) and then wanted to delete the error memory… when that was done I wanted to make a level basic setting by tester and then the fun started. Vehicle lowers at the front completely from u nd also stopped just like that… back exactly the other way round full program on hit back high… then eventually managed to lift it by tester in front and let off something so that I could still drive home… funny was however that the compressor ran continuously and wanted to lift further back although the car was standing for a long time on hit back… When I arrived at home he was back again relatively high and was also very hard in the back… front bl ieb everything as it was still set at the workshop. Today a friend of mine was working relatively much with vcds to make the basic setting with me… now stands in the error memory which from the level sensor back right unplausible signal. We looked at the values of all sensors and all give us a signal and also the values lie by axis close to each other… Furthermore he gives now even though the vehicle is completely moderate in height there is constantly the message i m Display “stop vehicle too deep” The sensors were unscrewed Werder any other thing… Is that supposed to be a coincidence that the sensor has it behind it or does anyone know these symptoms???