Friends

I need some help please with INPA.

I have the 4.8is which uses the twin axle air suspension. Since buying the car I have intermittent "Air Suspension Inactive" messages which would stop the suspension from raising or lowering. After some investigation, I found that the compressor piston was worn and tired. I replaced this and the seals using the kit from bagpipingandy.com. All was good and the suspension worked for a few days before the dreaded "Air Suspension Inactive" came back along with the Tyre Pressure Light.

Using INPA I can see no errors in the suspension and all looks good. I can use INPA to clear the "Inactive" message but it would come straight back.

Now by digging deeper into INPA I can see that the calibration/ride height setting are all over the shop and appear to bear no relation to the actual ride height. Each corner displays a different height in INPA.

What I want to do is to re-calibrate the suspension to factory (I have those measurements, which are helpfully posted in INPA).

What I need to know is how to actually zero all the existing measurements so that the suspension can be re-set to factory. I spent over an hour with the laptop last night and got nowhere.

Can anybody please tell how I reset to default. NB. If I enter the number on INPA the system and the car do not like it as it thinks I am adding to what is there already. I have tried to use +/- numbers, like -200 or 200. BUt I need the system to be at zero so that when I enter the default (say 707 on the front) it sets the height at 707 and NOT 707 + what is already in the system.