oK, THINK i HAVE SORTED THE PROBLEM, REPLACED SENSOR, STILL THE SAME PROBLEM, LOOKED AT VARIOUS YOUTUBE STUFF, HAD A LOOK AT THE ORIGINAL SENSOR, NO TELLTALE TRACKING ON THE BOTTOM FACE, SO, SQUIRTED SOME SWITCH CLEANER INTO THE 2 HALVES OF THE PLUG/SOCKET, REINSTALLED THE ORIGINAL SENSOR CONNECTED UP, VCDS'D THE SYSTEM AND IT ALL RESET, WENT FOR A DRIVE, STILL CLEAR, I think maybe moisture got into the plug etc a few weeks ago, when i hosed off the wheel arches etc, who knows, i am now a happy bunny!!!
Sorry about the capitals, couldn't be bothered to rewrite it all.