RR levelling valve fault & rear pads

i have recently replaced the NSF levelling valve on my RR ,05 and when i took it to be recalibrated the guy said it was'nt getting the correct voltage? any idea's? coming up on screen as suspension fault when you start up but then goes off 2min later. Also just changed rear pads and warning light on dash is still on with check brake pad message, does this code need to be reset? thanks