Had last week also a hard fault at client´s car (04 RR), display says "self leveling inactive", the client had refurbished his compressor four month ago with an aftermarket piston-ring from the bay, and now the compressor becomes lazy again. I opended the cylinderhead, and the new pistonring destroyd the cylinderhead more an more. So I sold him a used compressor (the client is very stingy....), and made reset with BMW INPA, for X5 E53, two way suspension program, and all five faults gone out..., client happy for alltogether little 130 Euros.... TDV8 4.4 from 2012, 278.000km like new + Lancia Flavia Coupe 1964 + RRS L494 3.0 SDV6 + C220CDI Convertible 2021