I had the engine replaced in this 300c and it was driven away from the mechanics workshop with out the key fob. At the time it said something like "key left the vehicle". Now (with the key fob in the car) it starts and runs for a few seconds then dies. I can't see any errors desplayed other that a small red light flashing on the dash (between the Speedo and RPM gauges. Can anyone he'll me fix this problem?