Discovery 4 sdv6 GS Dreaded suspension fault help needed

[LiverghoulsSDV6]

Hi all I have a discovery 4 3.0l sdv6 GS and the suspension fault.is constantly showing on screen , I've changed the front valve block for some reason hoping that was it but still there ,pulled fuse last night left and the only strut that showed any difference this morning was the front passenger one by half a centimetre that was it surely not enough to show fault , has anyone else had this problem no fault codes showing at all just says suspension fault every time i start car and constant but still raises and drives fine any help appreciated please ,would it be worth changing the rear valve block also or not is there a possibility it could be that one ? Thanks for your help in advance ,Tony

 

[Rover Range]

What DTCs do you have?
Throwing parts at it will cost you way more than a proper diagnosis.

 

[LiverghoulsSDV6]

Hi no codes showing up at all , just raised to off road height and pulled 27 measured and will see in morning if dropped ,no codes at all coming up ?

 

[LiverghoulsSDV6]

Have left overnight all struts still inflated the same measurements as 7pm last night and just took measurements now the same no air escaped but as soon as.i.put fuse back in it dropped to normal height ?,will check battery current just waiting for friend to return my multimeter later today ! Could it lowering when putting fuse back in be something or is that normal ? And already changed front valve block it's pointing to compressor I believe ? Or weak battery ? We will see

 

[LiverghoulsSDV6]

I'm getting code U0421 on autocom saying invalid data from ride control module could this be the problem ? ,battery is 12.6 volts also.

 

[LiverghoulsSDV6]

Hi so now I finally have these codes showing does anyone know what they mean please is the supply to sensors broken ,c1a70 pressure does not decrease when venting gallery and c1a70 rear left height sensor supply ,thanks all

 

[LiverghoulsSDV6]

I've got the compressor case off and the brackets so corroded it's split piece missing too video attached and photo of details on compressor all that's on it if you know what type of compress it is from the details that would be a great help so I know which exact fixings kit I'd need ,thanks very much for all your help were very grateful!