You were driving on the motorway in your Renault kangoo when you had a sudden loss of powerit still runs but now struggles uphill any suggestions?

I am yet to take my 1.5 DCi Diesel (2005) Kangoo to the local garage, but I believe this may be caused by either fuel filter blockage or a defective sensor on the Cam Shaft or Crank Shaft. First experienced intermittent loss of power about a month ago. My Engine Management Light illuminated for the first time only yesterday, and now remains on (as I write). To be updated!