Guess I have a few gremlins in the air suspension. I have tried to read everything and every post on the air suspension but can't really find a solution for one of my issues.

I Solved the first issue easily by drilling the exhaust silencer. Now the suspension lowers as it should when access height is selected. Before fixing the silencer it would more or less always go to off road height instead of lowering.

The other issue has been a bit more tricky. I have the code C1A20-64 "Pressure increase too slow". When starting the car the compressor runs quite long, maybe two minutes. If I lower the car and then raise it again the compressor only runs during the lift and then turns off directly when it reaches its level. It of course might be the compressor that needs replacing but since it is only slow sometimes I suspect something else is wrong also.

I have also had the occasional "Only normal ride height available" with disabling of the ACC and EIB and sometimes also the auto terrain response. Since drilling the silencer this only happened once in the last few days.

Anyone experienced similar issues?

I had the same see this thread.
https://www.fullfatrr.com/forum/topic59778.html 2018 SE SDV8 4.4 Byron Blue

Thanks Kot,

I've read your thread but my car is a 2015 which has an older compressor without the part you mention. I can't seem to find any equivalent part on the older compressor.