Ok on my Jag 2005 vanden plas i got the dreaded air suspension fault so i took of the compressor to check it out and in the process the small black air line that connects to the compressor pulled out of the screw in connector. Does any one know what part number of that black air line is so i can replace it. Also whats the best way to find out which air shock is leaking.

 

 

On the lines some bubblemaker soap water and on the shock itself if you can freeze the car in the extended position and see what corner falls after a period of time . There is a Jaguar TSB on using a Jaguar specified leak detector fluid that I think is oil based . The seals in the compressor can be replace yourself as the Teflon piston seal wears out . See below video if I can find it : The Bilstein shock upper air part can be rebuilt as part are available .