LS 2006 Focus with U1039 DTC: any thoughts?

[Webel117]

G'Day,
Name's Les: an 81yr old 'Newbie' whose first Ford was a '55 Anglia when I was 17. After graduating through XK, XL, XP's when they were new, I have just replaced the engine mounts and LH Driveshaft on the Focus and after a month of smooth running I have got an engine light and one Red light (not listed in the owner's manual as to what that means).
Any ideas about fixing this would be appreciated if anyone has seen this code before.