One problem related to engine shut off without warning has been reported for the 2002 BMW X5. The most recently reported issues are listed below.
Over several occasions, the car engine shut down while we are driving. We can turn it on just after when we can get the car to a safe spot. I took the car to the BMW and they tell me nothing is wrong with the car!! this is a major safety issue and my wife had almost had a bad accident for this.