red engine light flashing?

i have a red engine light flashing on the dash of my renault kangoo 52 plate van and it will start up for 5 seconds then stops ,1.5 dci turbo after it starts the next time tryed it wont start ,had laptop plugged in and found fault code 1086 but comes up unknown.thought it was immobiliser but light goes out for that . can any 1 help with this unknown code fault please.

john
March 2010