I have a 2002 kangoo 1.5 dci. it starts fine and runs but every time I accelerate or put the engin under load I get 3 warning lights on the dash. they clear once i take my foot of the pedal. Ive cheaked it with snap on and it stored: rail pressure regulator high flow current below minimum, and rail pressure regulator above maximum. any ideas please before i spend a fortune with a specialist???