Today, after sitting outside for 8 hours, the rear of the Rover is completely deflated. It was -10 degrees yesterday with no problems and the same temperature today. Now, I have it in a heated garage. The Air Suspension Inactive is displayed on the dash. The full right and full left wheel lock will not clear it. I have read all the threads here and have found some pretty good descriptions of the system on this website and elsewhere on the Internet. What I don't know is where to start. Do I need a code reader to better pin point the problem and clear the code? Will a code reading that the auto parts stores do for free work on this system? If not, what would be a good one to purchase? I can't check for leaks as I do not believe the air compressor is active when the Air Suspension Inactive warning is illuminated. - Is this correct? Also, since it is the entire rear that has dropped, does this indicate anything? Thanks and sorry to start another air suspension thread. I wish there was a document on step-by-step of how to diagnose the system.