Hi guys, so I'm having the same problem with my rear left air suspension...you can hear the air escaping and takes a lot to fill up...so do I need to change the pneumatic spring or can it be something else like a seal? If It is the pneumatic spring then I see in RealOEM that there are 4 different models for it (although 3 of them have the same part number).

NORMAL
SPORT SUSPENSION
2-AXLE SELF-LEVELING SUSPENSION
2-AXLE SELF-LEVELING SUSPENSION + SPORT SUSPENSION

Mine is a 2001 4.4i SPORT so I know I have sport suspension...but what about the 2-AXLE SELF-LEVELING, how do I know if I have that? Thanks guys!