Looks like i fixed it. A painful job i must say very hard to get too lucky i have small hands. Pulled of the plug contacts where green cleaned them up and put some electrical grease on them. Now the hard part got a socket on the sensor put on an angle adapter and an extension loosened it of and re tightened it just in case it was a bad earth problem. Cleared fault codes went for a drive until engine temp was up and all fine now.