Renault Megane 03 fault?

Hi. Can anyone give me an idea as to what could have caused a problem i have with my renault megane 1.9di. I have only had the car about 3 months when it started coughing huge plumes of white smoke out of the exhaust, then i came to start it the day after and all the lights went out on the dashboard. Since this happened i have had to replace the turbo unit which was drinking oil faster than i could drink a shot of whisky. Then the in-line fuse had to be replaced on the battery terminal. Still it coughs out plumes of smoke and the "Check injector" light is glowing. The car has only done 62000 miles, but i dread that indead it could also be an injector problem. Could anyone help on this matter? Any help would be much appreciated.