I have a 2014 LR4. Has anyone had trouble with their air suspension. Or has anyone traded it out for spring suspension? My mechanic has bought two different brands and neither of them will hold air. What are the pros and cons to changing them out. Does anyone have helpful advice for me?

 

your mechanic has bought two different barnds of what? bag/shock assemblies? If so, you probably need to go with oem or good rated aftermarket like ARnott.
Is mechanic sure it is the bags? I would not convert to spring sus.

 

air sus

 

Find a new mechanic. These systems are rather simple. But first what has he replaced? what are the symptoms, what are the codes. You need to help us help you.

 

I feel like your mechanic should already know this, but it may not necessarily be your air shocks/struts. It can be an air suspension valve block going bad as well. The good news is that it'd be much cheaper than air shocks. I would think that the best method to find your source of leak is to air it up and listen for a hiss. If inaudible and only leaks overnight you should be able to see if one of the corners is going down in air/one of the axles. It's all a matter of playing the process of elimination.