gcc;1027257 said:Hi Roy Koh,
Have the same problem once with my 740li. Was driving near BOSS in Sin Ming so ask Nicholas to check! He link his computer to my car
and in a short while is able to pin-point the fault. Went back to Performance as it is still under Warranty. They fixed the problem and all is well. Is your car still under Warrant? If yes sent it to them, as It is obvious something is wrong. Otherwise you can try Nicholas of BOSS.