Sierrafery, thanks for all your help, it worked. Bloody genius! Now I just need to get it onto a test computer and find the fault.

Thanks again. well the compressor runs, so I'll sort out the feed to the valve blocks and up she goes, I hope. Do you what opens the valves, a live feed?

Thanks again, I thought there must be away to get the compressor running. Basically put a feed to the compressor but disconnect the valves. Thanks, looks like some tonioght under the disco.

So, if I replace both the ride height sensors, disconnecting the battery first, it should kick the compressor back in?

Thanks, tried that. Still no joy. any pointers would be great.

Can anyone help. The air suspension on my TD5 would not come down, I think one of the ride height sensors had gone over its limit. So I released the air from the springs at the compressor. Now it won't go back up. Any ideas on how to reset the ride heights without a Landrover testbook?