When i try to switch it on the D4 light flashes. And the engine light does not go away. I have read alot about preludes doing this type of thing but with my car after 10 minutes pause it turn on and drives smoothly and plus my transmission is perfectly fine it changes gear in auto at right rpm's and plus in manual it never gives me trouble. One concerning issue is the other day it turned off on the go and this thing happened twice with in adistance of 4 km drive. Not sure if the computer tripped or what plus the engine oil was very low. Any help