right where do i start, well i have a 1997 p38 which i have had for over a year now with no problems. however the compresser has always been slow pumping up in the mornings or when ever it has been left for a day or so. One morning got in the rr waited on the drive for it to go up but got impatient and drove off, went about 2 miles along the road hit a pot hole and warning lights comes on, eas on dash and all lights on the height switch. that was six months ago still off the road, been to rr dealer twice now and there diagnostic wont read my ecu to find the fault. I put a second hand ecu 16pin plug in as other was correded. Once again took it back to rr and still the same. Since then i have put the whole compressor package (under the bonnet) on my rr, took it from my diesel one as there is 100% no problems with it, changed the all the height ride sensors (today) still nothing. Oh forgot to say about two weeks ago i parked the front wheels on the curb and the car when up but to full height and stayed there for a few days then dropped to the floor again, thats what made me think it was the height ride sensors. Is there any way that i can reset the ecu please help thanks jon