Yes, there are height sensors on both front air bags and 1 on the drivers side rear. All three can be adjusted.
they only went up to 1998
Either the air suspension relay that is behind the passenger side wheel well or the compressor.
in the fusebox behind the battery....the leftside with the big fuses...the ninth one is the fuse for the air suspension / evo steering .
Not that I know of. Yes see answer posted by "Lincolnator" on how to do this.
Yes, turn the switch off.
I think the check suspension plug is under the hood on the pass. side and you would need a OBD1 scanner to check it. It's usually gray in color and says air suspension on it.
Usually in the trunk on the right hand side behind the carpet.
Could be one or both of the front air bags or the spider valve in the compressor.
The Mark 8 does not have a check-valve in the air suspension system. Each air spring has a solenoid valve, which controls fill and vent of the spring. There is a fifth in the suspension compressor itself, which controls venting the system. I discovered that the seat for vent valve was corroded in my compressor, which would then leak when the system was trying to fill. This resulted in the compressor running, but the car lowering. I was able to clean the seat up for a temporary repair, but ultimately replaced the compressor.
Below is a link to the instructions for that installation.
Try turning the switch off in the trunk on drivers side.
Go to Strutmasters.com. They offer a conversion kit and it comes with instructions on how to convert from Airbags to springs.