The air suspension is not complicated at all. It comprises of a couple of balloons, an air pump and a set of quite basic electronic controls that make it all work.
Air bags/pipes can leak
Compressors can wear out
Ride height sensors can fail
Never heard of a computer going wrong.
Land Rover suggest that the air bags be changed every 5 years. Check the service history and if not ... change them.
and factor £200 for the parts, do the ride height sensors as well for £50. **** easy job, like changing a lightbulb but with jacks..!
I have had problems with my air suspension, but for the ride quality I wouldnt change them for coils...
If you are looking for an off road workhorse or playtoy then maybe air is not the best idea... but then nor is the 6-7k or so you'd spend on a TD5 with air....Saying that my TD5 is not without it's scratches, I've taken it where all the tricked up Greenlaners have been and it's performed superb. The air even giving it an advantage!
One thing about the Disco 2 is it's slightly longer overhang at the back compared to the disco 1. The air suspension overcomes this when in off road mode as in adjusts the departure angle in favor of the Disco1's.