I've got a 53 reg Focus TDCI and it jumped onto limp home mode this morning. After I stopped it started fine and has been ever since.

I bought one of those RAC diagnostic readers from argos today, but it won't pick up the system.
It scans through 5 protocols but came up with an error each time, in other words, can't pick up the OBD system.

Has anyone got any ideas if this thing works on 53 reg Focus's??