Please can someone help me here, my RR suspension is not rising on NSF and just coming up suspension fault on dash.i'm getting a bit sick of it now so any sensible suggestions.thanks

NSF Suspension Air bag leaking or knackered ride height sensor most likely - if other corners are raising ok then compressor should be ok?...

...never tried it myself but there is a method of checking the airbag by spraying reasonably strong solution of soapy water on to it and seeing if bubbles appear

no air leaks, had a sensor on but still not going up.

Maybe Air Valves Unit blocked / faulty?
(Again, not very sure exactly what its called - just trying to offer suggestions)

Was the new sensor re-calibrated?

Sounds like you need a new shock - I had the same problem in my Jaguar

i went to get suspension calibrated and guy said it was'nt geeting signal, so i've put old unit back on and still the same.

If it isn't getting a signal it could be a poor connection, broken wire or you might need to find someone who knows what they are doing