superb greenline 2 lights on  and in limp home mode help

Could be many things. Glow plug light is an indicator or many possible problems.

Mine did the Same a few years back and it was the throttle valve control module that needed replacing. It then did it again and it was the turbo actuator. Both fairly straight forward fixes.

Get it scanned for error codes. Should tell you exactly what you need.

as gianthotdog said could be many things I run mine for nearly 2 weeks in limp mode while visiting Cornwall having had turbo actuator replaced twice turned out it was a bad earth from ECU all good now some times error codes can be misleading if there is a bad earth auto electrician should be able to sort it out  good luck 

thanks for the info